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Commitments and Contingencies (Additional Information) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 4.0 $ 4.0 $ 4.4