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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, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities: |  |
Accelerated depreciation | $ 221,627 | $ 208,539
Prepaid costs currently deductible | 5,668 | 4,845
Other | 5,011 | 4,703
Total deferred tax liabilities | 232,306 | 218,087
Deferred tax assets: |  |
Accrued costs not yet deductible | 8,860 | 7,796
Allowance for doubtful accounts | 486 | 486
Deferred revenues | 2,512 | 1,774
Share-based compensation | 2,178 | 1,367
Total deferred tax assets, net of valuation allowance of $0.2 million in 2019 and 2018 | 14,036 | 11,423
Deferred income taxes, net | $ 218,270 | $ 206,664

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