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Income Taxes - Deferred Income Taxes Related to Temporary Differences between Tax Bases of Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax liabilities: |  |
Accelerated depreciation | $ 286,618 | $ 272,496
Prepaid costs currently deductible | 6,997 | 6,358
Other | 5,034 | 4,404
Total deferred tax liabilities | 298,649 | 283,258
Deferred tax assets: |  |
Accrued costs not yet deductible | 8,638 | 7,463
Allowance for doubtful accounts | 804 | 788
Net operating loss carry forwards and credits | 577 | 302
Deferred revenues | 1,945 | 1,132
Share-based compensation | 3,334 | 4,671
Total deferred tax assets | 15,298 | 14,356
Deferred income taxes, net | $ 283,351 | $ 268,902

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