Basis of Presentation - Additional Information (Details) - USD ($)	Mar. 31, 2018	Jan. 01, 2018
New Accounting Pronouncement Early Adoption [Line Items]
Capitalized mobilization costs	$ 0	$ 0
Accounting Standards Update 2014-09 | Retained Earnings [Member]
New Accounting Pronouncement Early Adoption [Line Items]
Estimated net cumulative decrease to retained earnings		$ 15,200,000
Maximum [Member]
New Accounting Pronouncement Early Adoption [Line Items]
Percentage of completed contracts with customers		90.00%