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Summary of Significant Accounting Policies - Revenue Disaggregated by Geographic Location and Contract Type (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 2,764,095	$ 2,807,259
Percentage Of Total Revenues	100.00%	100.00%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 974,651	$ 895,044
Percentage Of Total Revenues	35.30%	31.90%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 688,084	$ 958,355
Percentage Of Total Revenues	24.90%	34.10%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 1,101,360	$ 953,860
Percentage Of Total Revenues	39.80%	34.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 2,268,086	$ 2,200,615
Percentage Of Total Revenues	82.10%	78.40%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 384,225	$ 485,430
Percentage Of Total Revenues	13.90%	17.30%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 51,050	$ 41,324
Percentage Of Total Revenues	1.80%	1.50%
Latin America and Other
Disaggregation of Revenue [Line Items]
Revenues	$ 60,734	$ 79,890
Percentage Of Total Revenues	2.20%	2.80%

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Percentage Of Total Revenues

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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