Leases - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019
Lessee Lease Description [Line Items]
Lease, practical expedients, package [true false]	true
Office Space
Lessee Lease Description [Line Items]
Lessee, operating sublease, option to terminate	All of our subleases have terms that end in 2020 or 2022. The sublease agreements are non-cancelable through the end of the term and both parties have substantive rights to terminate the lease when the term is complete.
Field Equipment
Lessee Lease Description [Line Items]
Lessee, operating lease, option to extend, description	Our compressor and cooler arrangements are typically structured with a non-cancelable primary term of one to two years and continue thereafter on a month-to-month basis subject to termination by either party with thirty days notice.
Lessee operating lease notice period for renewal	30 days
Vehicle Fleet
Lessee Lease Description [Line Items]
Lessee operating lease notice period for renewal	3 years
Lessee operating lease contract of team description	Our vehicle agreements are non-cancelable for a minimum of one year and a maximum term of four to eight years depending on the type of vehicle. However, we have assumed a term of three years based on the period covered by options to terminate that we are reasonably certain to exercise.
Maximum
Lessee Lease Description [Line Items]
Short-term leases initial term	1 year
Lessee, operating lease, contract term	1 month
Maximum | Office Space
Lessee Lease Description [Line Items]
Lessee, operating lease, contract term	15 years
Maximum | Field Equipment
Lessee Lease Description [Line Items]
Lessee, operating lease, contract term	2 years
Maximum | Vehicle Fleet
Lessee Lease Description [Line Items]
Lessee, operating lease, non-cancelable maximum contract term, depending on type of vehicle	8 years
Minimum | Office Space
Lessee Lease Description [Line Items]
Lessee, operating lease, contract term	1 year
Minimum | Field Equipment
Lessee Lease Description [Line Items]
Lessee, operating lease, contract term	1 year
Minimum | Vehicle Fleet
Lessee Lease Description [Line Items]
Lessee, operating lease, contract term	1 year
Lessee, operating lease, non-cancelable maximum contract term, depending on type of vehicle	4 years