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Summary of Significant Accounting Policies - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 3,112,218	$ 2,985,281	$ 2,656,348	$ 2,417,576	$ 2,478,627	$ 2,609,307	$ 2,200,374	$ 2,178,170	$ 11,171,423	$ 9,466,478	$ 7,651,319
Percentage of total revenues									100.00%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues									$ 3,828,997
Percentage of total revenues									34.30%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues									$ 4,835,401
Percentage of total revenues									43.30%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues									$ 2,507,025
Percentage of total revenues									22.40%
United States
Disaggregation of Revenue [Line Items]
Revenues									$ 8,575,341
Percentage of total revenues									76.70%
Canada
Disaggregation of Revenue [Line Items]
Revenues									$ 1,984,214
Percentage of total revenues									17.80%
Australia
Disaggregation of Revenue [Line Items]
Revenues									$ 377,453
Percentage of total revenues									3.40%
Latin America and Other
Disaggregation of Revenue [Line Items]
Revenues									$ 234,415
Percentage of total revenues									2.10%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045

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