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Goodwill and Intangible Assets - Goodwill (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance, Goodwill Gross Carrying Amount $ 735,323 $ 727,999
Sale of business, Gross Carrying Amount   (3,115)
Foreign currency translation, Gross Carrying Amount 2,447 10,439
Ending balance, Goodwill Gross Carrying Amount 737,770 735,323
Beginning balance, Accumulated Impairment (Loss) (144,276) (139,414)
Impairment loss, Accumulated Impairment (Loss)   (4,862)
Foreign currency translation, Accumulated Impairment (Loss) 0 0
Ending balance, Accumulated Impairment (Loss) (144,276) (144,276)
Beginning balance, Goodwill Net 591,047 588,585
Sale of business, Net   (3,115)
Impairment loss, Net   (4,862)
Foreign currency translation, Net 2,447 10,439
Ending balance, Goodwill Net $ 593,494 $ 591,047