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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
Dec. 06, 2013
Petition
Aug. 17, 2012
Motion
Dec. 31, 2013
Dec. 31, 2012
Dec. 12, 2013
Ambac [Member]
Dec. 12, 2013
Ambac Assurance [Member]
Loss Contingencies [Line Items]            
Rent expense     $ 5,293 $ 4,685    
Number of petitions filed 2          
Number of motions filed by rehabilitator   2        
Bonds redeemed         2,700  
Ambac Assurance's payment under a swap termination surety bond           $ 800,000