Balance Sheet Account Detail - Schedule of Amounts Presented in Accounts Payable and Other Accrued Obligations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Rebates and Chargebacks [Member]
Accounts Payable and Other Accrued Liabilities [Roll Forward]
Beginning balance	$ 20,167	$ 45,822
Add: provisions	98,317	75,498
(Less): credits or actual allowances	(108,667)	(101,153)
Ending balance	9,817	20,167
Data and Distribution, GPO Fees, and Inventory Management Fees [Member]
Accounts Payable and Other Accrued Liabilities [Roll Forward]
Beginning balance	3,386	8,284
Add: provisions	14,979	15,928
(Less): credits or actual allowances	(13,219)	(20,826)
Ending balance	5,146	3,386
Returns [Member]
Accounts Payable and Other Accrued Liabilities [Roll Forward]
Beginning balance	1,394	1,135
Add: provisions	2,123	1,486
(Less): credits or actual allowances	(1,208)	(1,227)
Ending balance	$ 2,309	$ 1,394