Reconciliation of Total Segment Profit to Operating Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment profit	$ 249,865	$ 228,500	$ 148,944
Charge for fair value write-up of acquired inventory sold	0	48,586	0
Amortization of intangibles	47,349	37,067	9,347
Contingent consideration fair value adjustment	0	(1,282)	(1,813)
Unallocated general and administrative expenses	84,448	122,775	47,173
Operating income	118,068	21,354	94,237
Interest expense	38,667	33,355	153
Interest income	429	1,336	317
Other (income) expense, net	(12,355)	2,727	(1,794)
Income (loss) before income tax expense (benefit) and equity in net loss of affiliates	$ 92,185	$ (13,392)	$ 96,195