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Commitments and Contingencies - Future Lease Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Lease, 2013	$ 4,680
Lease, 2014	4,180
Lease, 2015	3,535
Lease, 2016	2,540
Lease, 2017	354
Lease, 2018 and Thereafter	365
Lease, total	15,654
Sublease, 2013	(2,182)
Sublease, 2014	(2,152)
Sublease, 2015	(2,108)
Sublease, 2016	(2,053)
Sublease, 2017
Sublease, 2018 and Thereafter
Sublease, total	(8,495)
Net Commitment, 2013	2,498
Net Commitment, 2014	2,028
Net Commitment, 2015	1,427
Net Commitment, 2016	487
Net Commitment, 2017	354
Net Commitment, 2018 and Thereafter	365
Net Commitment, total	$ 7,159

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