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General - Fair Value of Identified Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Mar. 01, 2015	Mar. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill at March 31, 2015		$ 293,197us-gaap_Goodwill	$ 293,023us-gaap_Goodwill
Schultz Mechanical Contractors, Inc. [Member]
Business Acquisition [Line Items]
Cash	218
Receivables and cost and estimated earnings in excess of billings	1,100
Prepaid expenses and other current assets	22
Property, plant and equipment	162
Identified intangible assets	3,060
Accounts payable, accrued expenses and billings in excess of cost and estimated earnings	(453)
Total identifiable net assets	4,109
Total consideration recorded	7,697
Less: total identifiable net assets	4,109
Goodwill at March 31, 2015		$ 3,588