Fair Value Measurements - Fair Value, Balance Sheet Grouping (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Financial Assets
Commodity derivatives	$ 162,186	$ 3,916
Financial Liabilities
Commodity derivatives	0	5,082
Total
Financial Assets
Deferred compensation plan	1,047	2,033
Commodity derivatives	163,461	8,890
Financial Liabilities
Commodity derivatives	1,275	10,056
Level 1
Financial Assets
Deferred compensation plan	1,047	2,033
Commodity derivatives	0	0
Financial Liabilities
Commodity derivatives	0	0
Level 2
Financial Assets
Deferred compensation plan	0	0
Commodity derivatives	163,461	8,890
Financial Liabilities
Commodity derivatives	1,275	10,056
Level 3
Financial Assets
Deferred compensation plan	0	0
Commodity derivatives	0	0
Financial Liabilities
Commodity derivatives	$ 0	$ 0