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Minimum Future Rental Payments under Operating Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Commitments and Contingencies Disclosure [Line Items]  
2012 $ 30,471
2013 24,918
2014 22,357
2015 16,429
2016 12,525
Thereafter 26,286
Operating Leases, Future Minimum Payments Due, Total $ 132,986