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Employee Benefit Plans - Summary of Plan Information Relating to Participation in Multiemployer Pension Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Multiemployer Plans [Line Items]
Contributions	$ 126,191	$ 110,082	$ 85,235
National Electrical Benefit Fund
Multiemployer Plans [Line Items]
Contributions	35,399	29,161	22,912
Pipeline Industry Pension Fund
Multiemployer Plans [Line Items]
Contributions	10,132	13,585	6,954
Central Pension Fund of the IUOE & Participating Employers
Multiemployer Plans [Line Items]
Contributions	9,246	12,176	5,668
Laborers Pension Trust Fund for Northern California
Multiemployer Plans [Line Items]
Contributions	3,652	3,387	3,805
International Union of Operating Engineers Local 132 Pension Fund
Multiemployer Plans [Line Items]
Contributions	3,367	222	42
Eighth District Electrical Pension Fund
Multiemployer Plans [Line Items]
Contributions	3,332	3,208	3,089
West Virginia Laborers Pension Trust Fund
Multiemployer Plans [Line Items]
Contributions	3,321	509	129
Teamsters National Pipe Line Pension Plan
Multiemployer Plans [Line Items]
Contributions	3,318	3,602	1,661
Plumbers and Pipefitters National Pension Fund
Multiemployer Plans [Line Items]
Contributions	2,734	1,273	1,666
Locals 302 & 612 of the IUOE-Employers Construction Industry Retirement Plan
Multiemployer Plans [Line Items]
Contributions	2,620	2,194	2,269
Operating Engineers Local 324 Pension Fund
Multiemployer Plans [Line Items]
Contributions	2,310	1,969	1,291
Alaska Electrical Pension Plan
Multiemployer Plans [Line Items]
Contributions	2,287	2,143	2,701
Laborers National Pension Fund
Multiemployer Plans [Line Items]
Contributions	2,051	3,049	1,358
OE Pension Trust Fund
Multiemployer Plans [Line Items]
Contributions	1,922	1,703	1,508
Employer-Teamsters Local Nos 175 & 505 Pension Trust Fund
Multiemployer Plans [Line Items]
Contributions	1,209	50	0
Laborers District Council of W PA Pension Fund
Multiemployer Plans [Line Items]
Contributions	1,029	418	876
Alaska Laborers - Employers Retirement Fund
Multiemployer Plans [Line Items]
Contributions	411	536	1,216
Alaska Teamster Employer Pension Plan
Multiemployer Plans [Line Items]
Contributions	197	255	659
All other plans - U.S.
Multiemployer Plans [Line Items]
Contributions	29,136	21,365	26,869
All other plans - Canada
Multiemployer Plans [Line Items]
Contributions	$ 8,518	$ 9,277	$ 562

X

- Definition

Amount of contributions made to multiemployer plan by employer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
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-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 80
-Section 50
-Paragraph 5
-Subparagraph (e)(1)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947

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+ References

No definition available.

+ Details

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