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Revenue from Contracts with Customers - Schedule of Revenue, Remaining Performance Obligation (Details) $ in Thousands | Mar. 31, 2018 USD ($)
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Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 3,603,743
Remaining performance obligations, percent | 100.00%
UNITED STATES |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 3,444,838
Remaining performance obligations, percent | 96.00%
UNITED STATES | United States Electrical Construction And Facilities Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 1,133,811
Remaining performance obligations, percent | 31.00%
UNITED STATES | United States Mechanical Construction And Facilities Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 1,822,381
Remaining performance obligations, percent | 51.00%
UNITED STATES | United States Building Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 424,196
Remaining performance obligations, percent | 12.00%
UNITED STATES | United States Industrial Services [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 64,450
Remaining performance obligations, percent | 2.00%
UNITED KINGDOM | United Kingdom Building Services [Member] [Member] |
Schedule of Remaining Performance Obligations [Line Items] |
Remaining performance obligations | $ 158,905
Remaining performance obligations, percent | 4.00%

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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130556-203045 + Details
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