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Income Taxes - Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income tax expense at federal statutory rate |  |  |  |  |  |  |  |  | $ 30,487 | $ 44,731 | $ 36,885
State income taxes, net of federal benefit |  |  |  |  |  |  |  |  | 781 | 6,075 | 1,587
Benefit from lower foreign tax rates |  |  |  |  |  |  |  |  | (8,500) | (7,827) | (5,973)
Valuation allowance on foreign tax credits and net operating loss carryforward |  |  |  |  |  |  |  |  | 253 | 254 | 2,326
Other expenses not deductible for tax purposes |  |  |  |  |  |  |  |  | 2,466 | 3,082 | 2,719
Adjustment to reserve for uncertain tax positions |  |  |  |  |  |  |  |  | 456 | (3,547) | 658
Impact of 2017 U.S. tax reform — deferred tax |  |  |  |  |  |  |  |  | (63,525) | 0 | 0
Impact of 2017 U.S. tax reform — transition tax |  |  |  |  |  |  |  |  | 18,655 | 0 | 0
Other adjustments, net |  |  |  |  |  |  |  |  | (1,930) | (485) | 1,131
Income tax provision | $ (38,458) | $ 9,197 | $ 527 | $ 7,877 | $ (1,832) | $ 10,292 | $ 15,437 | $ 18,386 | $ (20,857) | $ 42,283 | $ 39,333

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: 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 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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