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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, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax liabilities: |  |
Accelerated depreciation | $ 195,694 | $ 293,141
Prepaid costs currently deductible | 4,152 | 6,572
Other | 4,405 | 5,747
Total deferred tax liabilities | 204,251 | 305,460
Deferred tax assets: |  |
Accrued costs not yet deductible | 7,880 | 9,785
Allowance for doubtful accounts | 484 | 809
Deferred revenues | 213 | 965
Share-based compensation | 1,045 | 1,882
Total deferred tax assets, net of valuation allowance of $0.8 million in 2017 and $0.7 million in 2016 | 9,622 | 13,441
Deferred income taxes, net | $ 194,629 | $ 292,019

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