Income Taxes - Summary of Reconciliation Between Expected Tax Expense and Actual Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed “expected” tax expense	$ 21,295	$ 62,179	$ 50,816
Increase (decrease) in income tax expense resulting from:
State income taxes (net of federal income tax benefit)	2,656	7,217	2,621
Foreign operations	(11,281)	(26,232)	(17,942)
Rate change impact on tax liabilities	(1,021)		(2,679)
Effect of valuation allowance	3,242	1,351	785
Uncertain tax positions	3,903	3,933	(2,661)
Tax credits	(3,493)	(993)	(3,325)
Non-deductible transaction costs	2,354
Other	325	(928)	(323)
Provision for income taxes	$ 17,980	$ 46,527	$ 27,292