Summary of Significant Accounting Policies - Derivative Financial Instruments and Hedging Activities - Additional Information (Detail) - Collar Contracts	Apr. 01, 2019 MMBTU bbl $ / bbl $ / MMBTU	Mar. 31, 2019 MMBTU $ / MMBTU
Natural Gas Contracts, in MMBTU
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU		44,604,500
Ceiling, Average price		3.52
Floor, Average price		2.46
Subsequent Event | Natural Gas Contracts, in MMBTU
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU	2,300,000
Ceiling, Average price	2.79
Floor, Average price	2.45
Contract expiration	2020-04
Subsequent Event | Oil Collar Contracts, in Barrels
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | bbl	23,000
Ceiling, Average price | $ / bbl	68.00
Floor, Average price | $ / bbl	50.00
Contract expiration	2020-04