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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, 2021 | Dec. 31, 2020
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Deferred tax liabilities: |  |
Accelerated depreciation | $ 244,141 | $ 217,125
Prepaid costs currently deductible | 6,069 | 5,039
Other | 6,553 | 5,970
Total deferred tax liabilities | 256,763 | 228,134
Deferred tax assets: |  |
Accrued costs not yet deductible | 11,010 | 9,200
Allowance for doubtful accounts | 548 | 536
Deferred revenues | 219 |
Share-based compensation | 2,561 | 2,321
Total deferred tax assets, net of valuation allowance of $0.2 million in 2021 and 2020 | 14,338 | 12,057
Deferred income taxes, net | $ 242,425 | $ 216,077

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