Related Party Transactions - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Sagent Agila LLC	Jun. 30, 2013 Sagent Agila LLC	Dec. 31, 2012 Sagent Agila LLC	Jun. 30, 2013 KSCP
Related Party Transaction [Line Items]
Receivables from related party			$ 2,954	$ 2,954	$ 1,404	$ 4,884
Payable for the acquisition of inventory			3,406	3,406	7,026
Distributed profit sharing receipt	$ 1,367	$ 563	$ 882	$ 2,734