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Goodwill and Other Intangible Assets - Estimated Future Aggregate Amortization Expense of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
2015 $ 34,823us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 28,430us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths  
2017 24,553us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2018 24,277us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2019 23,508us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
Thereafter 120,502pwr_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour  
Intangible Assets, Net $ 256,093us-gaap_FiniteLivedIntangibleAssetsNet $ 203,377us-gaap_FiniteLivedIntangibleAssetsNet