Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v2.4.0.8
Commitments and Contingencies - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Operating Leases [Line Items]      
Fair value of guarantees $ 0    
Rental expense $ 16,900,000 $ 15,700,000 $ 14,900,000
Minimum
     
Schedule of Operating Leases [Line Items]      
Lease expiration period 10 years    
Lease renewal periods 1 year    
Maximum
     
Schedule of Operating Leases [Line Items]      
Lease expiration period 25 years    
Lease renewal periods 5 years