Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) Segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 272,804				$ 233,711				$ 272,804	$ 233,711	$ 189,326		$ 252,836
Restricted cash	5,825				0				5,825	0	0		$ 0
Capitalized Computer Software, Additions									$ 4,400	7,900	6,600
Intangible liabilities amortization remaining terms									2 years
Number of reporting units | Segment									8
Gross profit	108,049	$ 144,491	$ 80,369	$ 56,283	100,707	$ 114,530	$ 74,570	$ 25,126	$ 389,192	314,933	301,370
Total cost of revenue									2,929,222	2,674,780	2,213,247
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Significant Accounting Policies [Line Items]
Net cumulative decrease to retained earnings as a result of adoption												$ 15,200
Construction Segment [Member]
Significant Accounting Policies [Line Items]
Gross profit										6,900	9,200
Total cost of revenue										6,900	$ 9,200
Workers Compensation and Public Liability [Member]
Significant Accounting Policies [Line Items]
Change in Loss Assumptions, Potential Effect on Operating Results and Financial Position									1,000
Health Insurance Product Line [Member]
Significant Accounting Policies [Line Items]
Change in Loss Assumptions, Potential Effect on Operating Results and Financial Position									$ 300
Minimum [Member]
Significant Accounting Policies [Line Items]
Intangible assets amortization remaining terms									1 year
Construction contracts warranty provisions period									6 months
Construction contracts longer warranty periods									2 years
Workers' Compensation Liability	500								$ 500
Minimum [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Increase in right-of-use assets and lease liabilities									$ 50,000
Maximum [Member]
Significant Accounting Policies [Line Items]
Intangible assets amortization remaining terms									20 years
Construction contracts warranty provisions period									1 year
Construction contracts longer warranty periods									10 years
Workers' Compensation Liability	1,000								$ 1,000
Percentage of completed contracts with customers												90.00%
Maximum [Member] | ASU 2016-02 [Member]
Significant Accounting Policies [Line Items]
Increase in right-of-use assets and lease liabilities									$ 65,000
3531 Construction Machinery and Equip [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									18 months
3531 Construction Machinery and Equip [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									7 years
Other Capitalized Property Plant and Equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									3 years
Other Capitalized Property Plant and Equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									20 years
Software Development [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									3 years
Software Development [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life									7 years
Water and Mineral Services [Member] | Inventories [Member]
Significant Accounting Policies [Line Items]
Advances to suppliers	13,400								$ 13,400
Non-US [Member] | Foreign Operations [Member]
Significant Accounting Policies [Line Items]
Receivables from foreign operations	7,100								7,100
Layne Christensen Company [Member] | Other Current Assets [Member]
Significant Accounting Policies [Line Items]
Restricted cash	4,300								4,300
Consolidated Construction Joint Venture [Member] | Joint Venture Consolidated [Member]
Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 131,965				$ 94,359				$ 131,965	$ 94,359