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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]      
Total rent expense and related taxes and operating expenses, under operating leases $ 3,464 $ 3,870  
Tax reserves, non-income tax related $ 723   $ 703