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Commitments and Contingencies - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 12 Months Ended
Mar. 26, 2009
Nov. 14, 2008
Feb. 22, 2007
Dec. 31, 2012
Dec. 31, 2006
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Mar. 02, 2009
Commitments And Contingencies Disclosure [Abstract]                  
Rent expense           $ 1,820,000 $ 1,677,000 $ 1,592,000  
Legal settlement cost     50,000,000            
Reimbursed by the insurance carriers     12,800,000            
Gain (loss) from the litigation-related settlements       1,975,000 (37,200,000)   1,975,000    
Jury awarded in damages to the Company   17,300,000              
Reduction in jury award                 4,000,000
Affirming the award 13,300,000                
Prejudgment interest 3,179,000                
Insurance carriers total 16,479,000                
Insurance carriers on cash payment             $ 1,975,000