Income Tax Expense (Benefit) (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Federal
Current									$ (6,889)	$ 7,895	$ 7,509
Deferred									18,024	7,021	9,491
Total									11,135	14,916	17,000
State
Current									379	1,542	2,492
Deferred									(4,096)	(2,397)	(1,687)
Total									(3,717)	(855)	805
Foreign
Current									15,117	13,335	9,717
Deferred									5,402	3,813	1,769
Total									20,519	17,148	11,486
Income tax provision	$ 18,856	$ 3,786	$ 5,825	$ (530)	$ 23,334	$ 9,433	$ 2,409	$ (3,967)	$ 27,937	$ 31,209	$ 29,291