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Future Minimum Payments Required under Operating Leases that have Initial or Remaining Noncancellable Lease Terms in Excess of One Year (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Schedule of Operating Leases [Line Items]  
2012 $ 10,495
2013 9,725
2014 8,546
2015 8,285
2016 7,051
Thereafter $ 113,736