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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, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred tax liabilities: |  |
Accelerated depreciation | $ 293,141 | $ 286,618
Prepaid costs currently deductible | 6,572 | 6,997
Other | 5,747 | 5,034
Total deferred tax liabilities | 305,460 | 298,649
Deferred tax assets: |  |
Accrued costs not yet deductible | 9,785 | 8,638
Allowance for doubtful accounts | 809 | 804
Net operating loss carry forwards |  | 577
Deferred revenues | 965 | 1,945
Share-based compensation | 1,882 | 3,334
Total deferred tax assets, net of valuation allowance of $0.7 million in 2016 | 13,441 | 15,298
Deferred income taxes, net | $ 292,019 | $ 283,351

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