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Balances of Intangible Assets (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets Excluding Goodwill [Line Items]    
Gross Intangible Assets $ 367,026 $ 205,501
Accumulated Amortization (129,996) (111,096)
Net Intangible Assets $ 237,030 $ 94,405
Tradenames and Trademarks    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted Average Amortization Period 20 years 20 years
Gross Intangible Assets $ 57,894 $ 37,894
Accumulated Amortization (14,034) (11,864)
Net Intangible Assets $ 43,860 $ 26,030
Customer relationships    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted Average Amortization Period 10 years 10 years
Gross Intangible Assets $ 290,415 $ 151,090
Accumulated Amortization (105,567) (92,686)
Net Intangible Assets $ 184,848 $ 58,404
Technology    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted Average Amortization Period 12 years 12 years
Gross Intangible Assets $ 16,517 $ 16,517
Accumulated Amortization (8,694) (6,546)
Net Intangible Assets $ 7,823 $ 9,971
Backlog [Member]    
Intangible Assets Excluding Goodwill [Line Items]    
Weighted Average Amortization Period 1 year  
Gross Intangible Assets $ 2,200  
Accumulated Amortization (1,701)  
Net Intangible Assets $ 499