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Goodwill and Intangible Assets - Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Goodwill And Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 290,323 $ 290,147
Acquired goodwill, Gross Carrying Amount 41,793  
Foreign currency translation, Gross Carrying Amount 348 176
Ending balance, Goodwill Gross Carrying Amount 332,464 290,323
Beginning balance, Accumulated Impairment (Loss) (139,414) (139,414)
Acquired goodwill, Accumulated Impairment (Loss) 0  
Foreign currency translation, Accumulated Impairment (Loss) 0  
Ending balance, Accumulated Impairment (Loss) (139,414) (139,414)
Beginning balance, Goodwill Net 150,909 150,733
Acquired goodwill, Net 41,793  
Foreign currency translation, Net 348 176
Ending balance, Goodwill Net $ 193,050 $ 150,909