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Intangible Assets by Major Class (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Goodwill And Intangible Assets [Line Items]    
Finite lived intangible assets, Weighted Average Useful Life in Years 13 years 4 months 24 days  
Finite lived intangible assets, Gross Carrying Amount $ 124,530 $ 139,408
Intangible assets, Accumulated Amortization 78,010 81,073
Finite lived intangible assets, Net Carrying Amount 46,520 58,335
Intangible assets, Gross Carrying Amount 130,130 145,008
Intangible assets, Net Carrying Amount $ 52,120 63,935
Customer Relationships    
Goodwill And Intangible Assets [Line Items]    
Finite lived intangible assets, Weighted Average Useful Life in Years 13 years 7 months 6 days  
Finite lived intangible assets, Gross Carrying Amount $ 119,736 128,512
Intangible assets, Accumulated Amortization 75,212 72,941
Finite lived intangible assets, Net Carrying Amount $ 44,524 55,571
Non-Competition agreements    
Goodwill And Intangible Assets [Line Items]    
Finite lived intangible assets, Weighted Average Useful Life in Years 6 years 6 months  
Finite lived intangible assets, Gross Carrying Amount $ 1,263 7,263
Intangible assets, Accumulated Amortization 1,246 7,052
Finite lived intangible assets, Net Carrying Amount $ 17 211
Computer Software, Intangible Asset    
Goodwill And Intangible Assets [Line Items]    
Finite lived intangible assets, Weighted Average Useful Life in Years 9 years 3 months 18 days  
Finite lived intangible assets, Gross Carrying Amount $ 3,171 3,273
Intangible assets, Accumulated Amortization 1,292 940
Finite lived intangible assets, Net Carrying Amount $ 1,879 2,333
Trade Names    
Goodwill And Intangible Assets [Line Items]    
Finite lived intangible assets, Weighted Average Useful Life in Years 3 years  
Finite lived intangible assets, Gross Carrying Amount $ 360 360
Intangible assets, Accumulated Amortization 260 140
Finite lived intangible assets, Net Carrying Amount $ 100 220
Indefinite-lived intangible assets, Useful Life Indefinite  
Indefinite-lived intangible assets, Gross Carrying Amount $ 5,600 $ 5,600