Segment Information - Geographic Information on Sales to External Customers (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
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers	$ 313,318	$ 273,746	$ 287,011	$ 256,708	$ 311,188	$ 275,159	$ 282,493	$ 265,045	$ 1,130,783	$ 1,133,885	$ 1,112,058
United States
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									593,539	530,845	528,178
Other
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales to external customers									$ 537,244	$ 603,040	$ 583,880