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Acquisitions Of Businesses
 6 Months Ended
Jun. 30, 2015
Business Combinations [Abstract]  
Acquisitions Of Businesses
Acquisitions of Businesses     
On June 1, 2015, we acquired a company for an immaterial amount. This company primarily provides mechanical construction services and has been included in our United States mechanical construction and facilities services segment. The purchase price for this acquisition is subject to finalization based on certain contingencies provided for in the purchase agreement. The acquisition of this business was accounted for by the acquisition method, and the price paid for the acquired business has been allocated to its assets and liabilities, based upon the estimated fair value of its assets and liabilities at the date of the acquisition.
During the three months ended June 30, 2015 and 2014, respectively, we recorded a reversal of less than $0.1 million and $0.2 million of liabilities resulting in non-cash income attributable to contingent consideration arrangements relating to prior acquisitions. During the six months ended June 30, 2015 and 2014, respectively, we recorded a net reversal of $0.2 million and $0.2 million of liabilities resulting in non-cash income attributable to contingent consideration arrangements relating to prior acquisitions.