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Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Commitments and Contingencies Disclosure [Line Items]      
Expiry of lease agreements 2025    
Rent and related expense $ 14,800,000 $ 13,300,000 $ 13,300,000
Sublease rental income $ 0 $ 70,000 $ 82,000
Royalty license expired 2023