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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, 2020 | Dec. 31, 2019
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Deferred tax liabilities: |  |
Accelerated depreciation | $ 217,125 | $ 221,627
Prepaid costs currently deductible | 5,039 | 5,668
Other | 5,970 | 5,011
Total deferred tax liabilities | 228,134 | 232,306
Deferred tax assets: |  |
Accrued costs not yet deductible | 9,200 | 8,860
Allowance for doubtful accounts | 536 | 486
Deferred revenues |  | 2,512
Share-based compensation | 2,321 | 2,178
Total deferred tax assets, net of valuation allowance of $0.2 million in 2020 and 2019 | 12,057 | 14,036
Deferred income taxes, net | $ 216,077 | $ 218,270

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