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Future Minimum Payments Under Non Cancelable Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Leases Future Minimum Payments [Line Items]  
2013 $ 14,818
2014 14,850
2015 14,443
2016 13,349
2017 9,974
Thereafter 23,820
Total $ 91,254