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Income Taxes - Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred Tax Liabilities: |  |
Accelerated Depreciation | $ 257,537 | $ 248,515
Prepaid Costs Currently Deductible | 4,794 | 4,597
Other |  | 2,451
Total Deferred Tax Liabilities | 262,331 | 255,563
Deferred Tax Assets: |  |
Accrued Costs Not Yet Deductible | 6,638 | 6,138
Allowance for Doubtful Accounts | 775 | 1,163
Net Operating Loss Carry Forwards and Credits | 2,736 | 12,103
Deferred Revenues | 305 | 1,300
Share-Based Compensation | 5,862 | 8,295
Other | 4,812 |
Total Deferred Tax Assets | 21,128 | 28,999
Deferred Income Taxes, net | $ 241,203 | $ 226,564

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