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Components of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Schedule of Intangible Assets Disclosure [Line Items]    
Goodwill, Gross $ 104,232 $ 15,772
Goodwill, Accumulated Impairment (2,205)  
Goodwill, Net 102,027 15,772
Indefinite-Lived Trade Names, Gross 62,216 7,616
Indefinite-Lived Trade Names, Accumulated Impairment 0 0
Indefinite-Lived Trade Names, Net 62,216 7,616
Intangible Assets, Gross (Including Goodwill) 410,334 126,729
Goodwill, Accumulated Impairment (2,205)  
Finite-Lived Intangible Assets, Accumulated Amortization (48,760) (38,250)
Intangible Assets, Net (Including Goodwill) 359,369 88,479
License    
Schedule of Intangible Assets Disclosure [Line Items]    
Finite-Lived Intangible Assets, Gross 15,847 15,847
Finite-Lived Intangible Assets, Accumulated Amortization (9,717) (9,375)
Finite-Lived Intangible Assets, Net 6,130 6,472
Trade Names    
Schedule of Intangible Assets Disclosure [Line Items]    
Finite-Lived Intangible Assets, Gross 38,355 33,368
Finite-Lived Intangible Assets, Accumulated Amortization (13,084) (11,109)
Finite-Lived Intangible Assets, Net 25,271 22,259
Customer Relationships    
Schedule of Intangible Assets Disclosure [Line Items]    
Finite-Lived Intangible Assets, Gross 183,250 52,961
Finite-Lived Intangible Assets, Accumulated Amortization (24,861) (16,966)
Finite-Lived Intangible Assets, Net 158,389 35,995
Other    
Schedule of Intangible Assets Disclosure [Line Items]    
Finite-Lived Intangible Assets, Gross 6,434 1,165
Finite-Lived Intangible Assets, Accumulated Amortization (1,098) (800)
Finite-Lived Intangible Assets, Net $ 5,336 $ 365