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Summary of Income Tax Provision from Continuing Operations Resulted in Effective Tax Rates (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate									$ 44,731	$ 36,885	$ 35,494
State income taxes, net of federal benefit									6,075	1,587	3,494
Benefit from lower foreign tax rates									(7,827)	(5,973)	(4,154)
Valuation allowance on foreign tax credits and net operating loss carryforward									254	2,326	4,604
Other expenses not deductible for tax purposes									3,082	2,719	2,962
Adjustment to reserve for uncertain tax positions									(3,547)	658	220
Other adjustments, net									(485)	1,131	(16)
Income tax provision	$ (1,832)	$ 10,292	$ 15,437	$ 18,386	$ 7,577	$ 6,177	$ 13,922	$ 11,657	$ 42,283	$ 39,333	$ 42,604

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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