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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, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 2,807,259	$ 2,417,576
Percentage Of Total Revenues	100.00%	100.00%
Unit-price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 895,044	$ 613,438
Percentage Of Total Revenues	31.90%	25.30%
Fixed price contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 953,860	$ 1,225,089
Percentage Of Total Revenues	34.00%	50.70%
Cost-plus contracts
Disaggregation of Revenue [Line Items]
Revenues	$ 958,355	$ 579,049
Percentage Of Total Revenues	34.10%	24.00%
United States
Disaggregation of Revenue [Line Items]
Revenues	$ 2,200,615	$ 1,712,427
Percentage Of Total Revenues	78.40%	70.80%
Canada
Disaggregation of Revenue [Line Items]
Revenues	$ 485,430	$ 538,358
Percentage Of Total Revenues	17.30%	22.30%
Australia
Disaggregation of Revenue [Line Items]
Revenues	$ 41,324	$ 119,457
Percentage Of Total Revenues	1.50%	4.90%
Latin America and Other
Disaggregation of Revenue [Line Items]
Revenues	$ 79,890	$ 47,334
Percentage Of Total Revenues	2.80%	2.00%

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Percentage Of Total Revenues

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+ References

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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