1001 - Document - Cover Page link:presentationLink link:definitionLink link:calculationLink 1002 - Statement - Consolidated Balance Sheets link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1004 - Statement - Consolidated Statements of Income link:presentationLink link:definitionLink link:calculationLink 1005 - Statement - Consolidated Statements of Comprehensive Income link:presentationLink link:definitionLink link:calculationLink 1006 - Statement - Consolidated Statements of Comprehensive Income (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1007 - Statement - Consolidated Statements of Cash Flows link:presentationLink link:definitionLink link:calculationLink 1008 - Statement - Consolidated Statements of Changes in Equity link:presentationLink link:definitionLink link:calculationLink 1009 - Statement - Consolidated Statements of Changes in Equity (Parenthetical) link:presentationLink link:definitionLink link:calculationLink 1010 - Disclosure - Significant Accounting Policies link:presentationLink link:definitionLink link:calculationLink 1011 - Disclosure - Acquired Business link:presentationLink link:definitionLink link:calculationLink 1012 - Disclosure - Other Comprehensive Income link:presentationLink link:definitionLink link:calculationLink 1013 - Disclosure - Investments link:presentationLink link:definitionLink link:calculationLink 1014 - Disclosure - Income Taxes link:presentationLink link:definitionLink link:calculationLink 1015 - Disclosure - Operating Property link:presentationLink link:definitionLink link:calculationLink 1016 - Disclosure - Retirement Plan link:presentationLink link:definitionLink link:calculationLink 1017 - Disclosure - Debt link:presentationLink link:definitionLink link:calculationLink 1018 - Disclosure - Leases link:presentationLink link:definitionLink link:calculationLink 1019 - Disclosure - Share-Based Payment Arrangements link:presentationLink link:definitionLink link:calculationLink 1020 - Disclosure - Equity link:presentationLink link:definitionLink link:calculationLink 1021 - Disclosure - Commitments and Contingencies link:presentationLink link:definitionLink link:calculationLink 1022 - Disclosure - Segment Information link:presentationLink link:definitionLink link:calculationLink 1023 - Disclosure - Change in Accounting Estimate for Self-Insured Claims link:presentationLink link:definitionLink link:calculationLink 1024 - Disclosure - Impairment of Intangible and Other Assets link:presentationLink link:definitionLink link:calculationLink 1025 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:definitionLink link:calculationLink 1026 - Disclosure - Significant Accounting Policies (Policies) link:presentationLink link:definitionLink link:calculationLink 1027 - Disclosure - Significant Accounting Policies (Tables) link:presentationLink link:definitionLink link:calculationLink 1028 - Disclosure - Other Comprehensive Income (Tables) link:presentationLink link:definitionLink link:calculationLink 1029 - Disclosure - Investments (Tables) link:presentationLink link:definitionLink link:calculationLink 1030 - Disclosure - Income Taxes (Tables) link:presentationLink link:definitionLink link:calculationLink 1031 - Disclosure - Operating Property (Tables) link:presentationLink link:definitionLink link:calculationLink 1032 - Disclosure - Leases (Tables) link:presentationLink link:definitionLink link:calculationLink 1033 - Disclosure - Share-Based Payment Arrangements (Tables) link:presentationLink link:definitionLink link:calculationLink 1034 - Disclosure - Segment Information (Tables) link:presentationLink link:definitionLink link:calculationLink 1035 - Disclosure - Change in Accounting Estimate for Self-Insured Claims (Tables) link:presentationLink link:definitionLink link:calculationLink 1036 - Disclosure - Significant Accounting Policies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1037 - Disclosure - Schedule Of Revenue By Major Customers By Reporting Segments (Detail) link:presentationLink link:definitionLink link:calculationLink 1038 - Disclosure - Summary of Activity in Allowance for Doubtful Accounts (Detail) link:presentationLink link:definitionLink link:calculationLink 1039 - Disclosure - Acquired Business - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1040 - Disclosure - Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 1041 - Disclosure - Investments - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1042 - Disclosure - Amortized Cost and Fair Value of Available-for-Sale Investments (Detail) link:presentationLink link:definitionLink link:calculationLink 1043 - Disclosure - Schedule of Unrealized Loss on Available-for-Sale Investments (Detail) link:presentationLink link:definitionLink link:calculationLink 1044 - Disclosure - Schedule of Provision for Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 1045 - Disclosure - Income Taxes - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1046 - Disclosure - Schedule of Deferred Tax Assets and Liabilities (Detail) link:presentationLink link:definitionLink link:calculationLink 1047 - Disclosure - Schedule of Income Taxes Calculated on Income from Continuing Operations Before Income Taxes and Provision for Income Taxes (Detail) link:presentationLink link:definitionLink link:calculationLink 1048 - Disclosure - Schedule for Gross Unrecognized Tax Benefits (Detail) link:presentationLink link:definitionLink link:calculationLink 1049 - Disclosure - Operating Property (Detail) link:presentationLink link:definitionLink link:calculationLink 1050 - Disclosure - Operating Property - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1051 - Disclosure - Retirement Plan - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1052 - Disclosure - Debt - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1053 - Disclosure - Leases - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1054 - Disclosure - Leases - Components of Lease Cost for Finance Leases and Operating Leases (Detail) link:presentationLink link:definitionLink link:calculationLink 1055 - Disclosure - Leases - Classification on our Consolidated Balance Sheet (Detail) link:presentationLink link:definitionLink link:calculationLink 1056 - Disclosure - Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Detail) link:presentationLink link:definitionLink link:calculationLink 1057 - Disclosure - Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Parenthetical) (Details) link:presentationLink link:definitionLink link:calculationLink 1058 - Disclosure - Leases - Weighted Average Remaining Lease Term and the Weighted Average Discount Rate for Finance and Operating leases (Detail) link:presentationLink link:definitionLink link:calculationLink 1059 - Disclosure - Share-Based Payment Arrangements - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1060 - Disclosure - Amounts Recognized in Financial Statements with Respect to Plans (Detail) link:presentationLink link:definitionLink link:calculationLink 1061 - Disclosure - Schedule of Information on Restricted Stock Units (Detail) link:presentationLink link:definitionLink link:calculationLink 1062 - Disclosure - Summary of Information Regarding Stock Options (Detail) link:presentationLink link:definitionLink link:calculationLink 1063 - Disclosure - Summary Stock Options Outstanding and Exercisable (Detail) link:presentationLink link:definitionLink link:calculationLink 1064 - Disclosure - Schedule of Information on Non - Vested Restricted Stock Units (Detail) link:presentationLink link:definitionLink link:calculationLink 1065 - Disclosure - Equity - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1066 - Disclosure - Commitments and Contingencies - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1067 - Disclosure - Segment Information - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1068 - Disclosure - Information Regarding Reportable Business Segments (Detail) link:presentationLink link:definitionLink link:calculationLink 1069 - Disclosure - Effect of Increase in Cost of Insurance and Claims (Detail) link:presentationLink link:definitionLink link:calculationLink 1070 - Disclosure - Impairment of Intangible and Other Assets - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1071 - Disclosure - Recent Accounting Pronouncements - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1072 - Statement - Leases - Undiscounted Cash Flows for the Finance and Operating Leases (Detail) Alternate 1 link:presentationLink link:definitionLink link:calculationLink