General - Fair Value of Identified Assets and Liabilities (Details) $ in Thousands, € in Millions	Jun. 02, 2016 EUR (€)	Jun. 02, 2016 USD ($)	May 13, 2016 USD ($)	Feb. 18, 2016 USD ($)	Mar. 01, 2015 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Business Acquisition [Line Items]
Goodwill						$ 297,223	$ 249,120
Underground Solutions
Business Acquisition [Line Items]
Cash				$ 3,630
Receivables and cost and estimated earnings in excess of billings				6,339
Inventories				12,629
Prepaid expenses and other current assets				587
Property, plant and equipment				2,755
Identified intangible assets				33,740
Deferred income tax assets				12,967
Other assets				29
Accounts payable				(4,653)
Accrued expenses				(5,274)
Billings in excess of cost and estimated earnings				(2,943)
Deferred income tax liabilities				(14,924)
Total identifiable net assets				44,882
Total consideration recorded				88,681
Less: total identifiable net assets				$ 44,882
Goodwill						43,799
Fyfe Europe
Business Acquisition [Line Items]
Cash			$ 0
Receivables and cost and estimated earnings in excess of billings			0
Inventories			0
Prepaid expenses and other current assets			0
Property, plant and equipment			50
Identified intangible assets			513
Deferred income tax assets			0
Other assets			0
Accounts payable			0
Accrued expenses			0
Billings in excess of cost and estimated earnings			0
Deferred income tax liabilities			0
Total identifiable net assets			563
Total consideration recorded			3,000
Less: total identifiable net assets			$ 563
Goodwill						2,437
LMJ
Business Acquisition [Line Items]
Cash		$ 0
Receivables and cost and estimated earnings in excess of billings		0
Inventories		504
Prepaid expenses and other current assets		0
Property, plant and equipment		1,194
Identified intangible assets		795
Deferred income tax assets		0
Other assets		0
Accounts payable		0
Accrued expenses		0
Billings in excess of cost and estimated earnings		0
Deferred income tax liabilities		0
Total identifiable net assets		2,493
Total consideration recorded	€ 2.9	3,235
Less: total identifiable net assets		$ 2,493
Goodwill						742
Schultz Mechanical Contractors, Inc.
Business Acquisition [Line Items]
Cash					$ 0
Receivables and cost and estimated earnings in excess of billings					1,086
Inventories					0
Prepaid expenses and other current assets					19
Property, plant and equipment					162
Identified intangible assets					3,060
Deferred income tax assets					0
Other assets					0
Accounts payable					(663)
Accrued expenses					0
Billings in excess of cost and estimated earnings					0
Deferred income tax liabilities					0
Total identifiable net assets					3,664
Total consideration recorded					7,662
Less: total identifiable net assets					$ 3,664
Goodwill						$ 3,998