Balance Sheet Account Detail - Schedule of Amounts Presented in Accounts Payable and Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Rebates and Chargebacks [Member]
Accounts Payable and Other Liabilities [Roll Forward]
Beginning balance	$ 45,822	$ 33,967
Add: provisions (recovery)	38,632	76,636
(Less): credits or actual allowances	(41,638)	(64,781)
Ending balance	42,816	45,822
Data and Distribution, GPO Fees, and Inventory Management Fees [Member]
Accounts Payable and Other Liabilities [Roll Forward]
Beginning balance	8,284	5,373
Add: provisions (recovery)	9,636	21,330
(Less): credits or actual allowances	(11,688)	(18,419)
Ending balance	6,232	8,284
Returns [Member]
Accounts Payable and Other Liabilities [Roll Forward]
Beginning balance	1,135	2,900
Add: provisions (recovery)	899	(78)
(Less): credits or actual allowances	(448)	(1,687)
Ending balance	$ 1,586	$ 1,135