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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Taxes [Line Items] |  |  |
Balance at the beginning of the year | $ (107,174) | $ (87,623) | $ (16,599)
Charged to provision for income taxes: |  |  |
Other state valuation allowances | (23,790) | 500 | (1,050)
Other federal valuation allowances | (247) | (477) | (511)
Rabbi trust valuation allowance | 2,304 | (1,066) | 3,494
Other | 0 | (34) | 0
Balance at the end of the year | (125,134) | (107,174) | (87,623)
State |  |  |
Charged to provision for income taxes: |  |  |
Net operating loss carryforwards | (11,612) | (17,374) | (30,457)
Federal |  |  |
Charged to provision for income taxes: |  |  |
Net operating loss carryforwards | $ 15,385 | $ (1,100) | $ (42,500)

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- Definition Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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