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Schedule of Provision for Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations [Abstract] |  |  |
Federal, Current | $ 48,794 | $ 18,453 | $ 11,748
State, Current | 4,077 | 3,681 | 2,997
Foreign, Current | 4,074 | 4,941 | 7,565
Income tax expense (benefit), Current, total | 56,945 | 27,075 | 22,310
Federal, Deferred | 88 | (4,742) | 9,215
State, Deferred | (1,342) | (890) | 693
Foreign, Deferred | (727) | 695 | (285)
Income tax expense (benefit), Deferred, total | (1,981) | (4,937) | 9,623
Total provision | $ 54,964 | $ 22,138 | $ 31,933

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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