Schedule I - Parent Company Only Financial Statements - Statements of Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Net income	$ 126,788	$ 4,135	$ 70,924
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(15,421)	(6,958)	(2,193)
Available for sale securities	(17,814)	19,259	2
Total other comprehensive (loss) income, net of tax	(33,235)	12,301	(2,191)
Comprehensive income attributable to common stockholders	97,429	14,498	69,046
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net income	126,788	4,135	70,924
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(14,172)	(5,859)	(1,878)
Available for sale securities	(15,187)	16,222
Total other comprehensive (loss) income, net of tax	(29,359)	10,363	(1,878)
Comprehensive income attributable to common stockholders	$ 97,429	$ 14,498	$ 69,046