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Intangible Assets (Detail)
$ in Thousands
6 Months Ended
Jun. 30, 2018
USD ($)
Goodwill and Intangible Assets  
Goodwill and intangible assets, Beginning Balance $ 88,479
Goodwill acquired 83,978
Foreign currency translation adjustment (841)
Amortization (7,096)
Goodwill and Intangible Assets, Ending Balance 366,198
Trade Names  
Goodwill and Intangible Assets  
Intangible assets acquired 57,200
Customer Relationships  
Goodwill and Intangible Assets  
Intangible assets acquired 139,200
Other  
Goodwill and Intangible Assets  
Intangible assets acquired $ 5,278