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Goodwill and Intangible Assets - Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Goodwill And Intangible Assets Disclosure [Abstract]    
Goodwill gross carrying amount, Beginning balance $ 290,147 $ 279,498
Acquired goodwill, gross    9,989
Foreign currency translation (33) 660
Goodwill gross carrying amount, Ending balance 290,114 290,147
Accumulated Impairment Loss, Beginning balance (139,414) (139,414)
Acquired goodwill, impairment loss      
Foreign currency translation, impairment loss      
Accumulated Impairment Loss, Ending balance (139,414) (139,414)
Goodwill, net, Beginning balance 150,733 140,084
Acquired goodwill, net    9,989
Foreign currency translation, net (33) 660
Goodwill, net, Ending balance $ 150,700 $ 150,733