Income Tax Expense (Benefit) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Federal
Current									$ 7,895	$ 7,509	$ 1,236
Deferred									7,021	9,491	56
Total									14,916	17,000	1,292
State
Current									1,542	2,492	1,150
Deferred									(2,397)	(1,687)	(142)
Total									(855)	805	1,008
Foreign
Current									13,335	9,717	9,258
Deferred									3,813	1,769	4,864
Total									17,148	11,486	14,122
Income tax provision	$ 23,334	$ 9,433	$ 2,409	$ (3,967)	$ 24,108	$ 5,347	$ 2,280	$ (2,444)	$ 31,209	$ 29,291	$ 16,422