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Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
2013 (remaining nine months)	$ 4,772
2014	5,916
2015	5,942
2016	5,253
2017	3,999
Thereafter	10,631
Total minimum payments	$ 36,513

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