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Commitments and Contingencies - Minimum Lease Payments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Commitments And Contingencies Disclosure [Abstract]
Remainder of 2013	$ 20,603
2014	21,498
2015	17,091
2016	13,583
2017	8,280
Thereafter	17,376
Total minimum lease payments	$ 98,431

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