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Income Taxes - Changes in Deferred Tax Asset Valuation Allowances (Detail) - Valuation Allowance of Deferred Tax Assets - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Balance at the beginning of the year | $ (125,134) | $ (107,174) | $ (87,623)
Charged to provision for income taxes: |  |  |
Other state valuation allowances | 16,380 | (23,790) | 500
Other federal valuation allowances | 494 | (247) | (477)
Other | 123 | 2,304 | (1,100)
Balance at the end of the year | (120,347) | (125,134) | (107,174)
State |  |  |
Charged to provision for income taxes: |  |  |
Net operating loss carryforwards | (23,926) | (11,612) | (17,374)
Federal |  |  |
Charged to provision for income taxes: |  |  |
Net operating loss carryforwards | $ 11,716 | $ 15,385 | $ (1,100)

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