Annual report pursuant to Section 13 and 15(d)

Goodwill and Identified Intangible Assets - Additional Information (Detail)

v3.10.0.1
Goodwill and Identified Intangible Assets - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]        
Goodwill, impairment loss   $ 0   $ 0
Remaining balance after impairment loss $ 504,317,000 504,317,000 $ 405,747,000  
Finite-Lived Intangible Assets        
Finite-Lived Intangible Assets [Line Items]        
Amortization   59,800,000 31,900,000 24,500,000
Trade names        
Finite-Lived Intangible Assets [Line Items]        
Remaining balance after impairment loss 22,956,000 22,956,000 $ 17,556,000  
Trade names        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets       $ 800,000
Level One | Trade names        
Finite-Lived Intangible Assets [Line Items]        
Remaining balance after impairment loss $ 1,000,000 $ 1,000,000    
Estimated useful life of finite-lived intangible asset 5 years      
Level One | Trade names        
Finite-Lived Intangible Assets [Line Items]        
Impairment of intangible assets $ 2,700,000