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Commitments and Contingencies - Future Minimum Lease Payments under Operating Leases (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Operating Leased Assets [Line Items]
2013	$ 6,284
2014	5,818
2015	5,938
2016	5,253
2017	3,999
Thereafter	10,631
Total minimum payments	$ 37,923

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