Description of Business and Basis of Presentation (Details)	3 Months Ended
	Mar. 31, 2019
Drilling Rigs
Lessee, Lease, Description [Line Items]
Extension period notice	30 days
Drilling Rigs | Minimum
Lessee, Lease, Description [Line Items]
Term of contract	1 year
Drilling Rigs | Maximum
Lessee, Lease, Description [Line Items]
Term of contract	2 years
Offices | Minimum
Lessee, Lease, Description [Line Items]
Term of contract	2 years
Offices | Maximum
Lessee, Lease, Description [Line Items]
Term of contract	5 years