Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) agreement integer
Contingencies And Commitments [Line Items]
Reimbursement Obligation To Construct Gas Gathering And Processing Facilities | $	$ 6.5
Minimum Volume Commitment	1
Sale Leaseback Transaction Early Buyout Option To Purchase Equipment | $	$ 1.8
Number of Firm Transportation Contracts | agreement	2
Number Of GTP Reimbursement Obligations	1
Number Of Other Commitments	1
Reimbursement Obligation, Reimbursement Period	1 year