Quarterly report pursuant to Section 13 or 15(d)

Acquisition - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail)

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Acquisition - Estimated Fair Values of Identifiable Intangible Assets and Related Weighted Average Amortization (Detail) - Jun. 30, 2015 - Acquisitions [Member] - USD ($)
$ in Thousands
Total
Finite-Lived Intangible Assets [Line Items]  
Estimated Fair Value at Acquisition Date $ 14,796
Weighted Average Amortization Period at Acquisition Date 13 years 1 month 6 days
Customer Relationships [Member]  
Finite-Lived Intangible Assets [Line Items]  
Estimated Fair Value at Acquisition Date $ 9,985
Weighted Average Amortization Period at Acquisition Date 17 years 6 months
Backlog [Member]  
Finite-Lived Intangible Assets [Line Items]  
Estimated Fair Value at Acquisition Date $ 1,327
Weighted Average Amortization Period at Acquisition Date 1 year 3 months 18 days
Trade Names [Member]  
Finite-Lived Intangible Assets [Line Items]  
Estimated Fair Value at Acquisition Date $ 2,374
Weighted Average Amortization Period at Acquisition Date 4 years 8 months 12 days
Non-compete Agreements [Member]  
Finite-Lived Intangible Assets [Line Items]  
Estimated Fair Value at Acquisition Date $ 1,110
Weighted Average Amortization Period at Acquisition Date 5 years