Balance Sheet Account Detail - Schedule of Amounts Presented in Accounts Payable and Other Accrued Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Rebates and Chargebacks [Member]
Accounts Payable and Other Accrued Liabilities [Roll Forward]
Beginning balance	$ 45,822	$ 33,967
Add: provisions (recovery)	(75,498)	(76,636)
(Less): credits or actual allowances	(101,153)	(64,781)
Ending balance	20,167	45,822
Data and Distribution, GPO Fees, and Inventory Management Fees [Member]
Accounts Payable and Other Accrued Liabilities [Roll Forward]
Beginning balance	8,284	5,373
Add: provisions (recovery)	(15,928)	(21,330)
(Less): credits or actual allowances	(20,826)	(18,419)
Ending balance	3,386	8,284
Returns [Member]
Accounts Payable and Other Accrued Liabilities [Roll Forward]
Beginning balance	1,135	2,900
Add: provisions (recovery)	(1,486)	78
(Less): credits or actual allowances	(1,227)	(1,687)
Ending balance	$ 1,394	$ 1,135