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Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 487,058 $ 469,748
Accumulated Amortization (275,755) (264,674)
Intangible Assets, Net $ 211,303 205,074
Remaining Weighted Average Amortization Period in Years 10 years 7 months 6 days  
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 247,186 236,731
Accumulated Amortization (96,673) (90,840)
Intangible Assets, Net $ 150,513 145,891
Remaining Weighted Average Amortization Period in Years 9 years 3 months 18 days  
Backlog [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 133,559 130,818
Accumulated Amortization (129,897) (126,954)
Intangible Assets, Net $ 3,662 3,864
Remaining Weighted Average Amortization Period in Years 9 months 18 days  
Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 54,560 51,192
Accumulated Amortization (10,492) (9,525)
Intangible Assets, Net $ 44,068 41,667
Remaining Weighted Average Amortization Period in Years 18 years 1 month 6 days  
Non-compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 29,257 28,560
Accumulated Amortization (24,336) (23,507)
Intangible Assets, Net $ 4,921 5,053
Remaining Weighted Average Amortization Period in Years 3 years 4 months 24 days  
Patented Rights and Developed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets subject to amortization $ 22,496 22,447
Accumulated Amortization (14,357) (13,848)
Intangible Assets, Net $ 8,139 $ 8,599
Remaining Weighted Average Amortization Period in Years 3 years 10 months 24 days