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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, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax liabilities: |  |
Accelerated depreciation | $ 208,539 | $ 195,694
Prepaid costs currently deductible | 4,845 | 4,152
Other | 4,703 | 4,405
Total deferred tax liabilities | 218,087 | 204,251
Deferred tax assets: |  |
Accrued costs not yet deductible | 7,796 | 7,880
Allowance for doubtful accounts | 486 | 484
Deferred revenues | 1,774 | 213
Share-based compensation | 1,367 | 1,045
Total deferred tax assets, net of valuation allowance of $0.2 million in 2018 and $0.8 million in 2017 | 11,423 | 9,622
Deferred income taxes, net | $ 206,664 | $ 194,629

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