Summary of Significant Accounting Policies - Additional Information 2 (Detail)		3 Months Ended
	May 11, 2020 USD ($) MMBTU $ / MMBTU	Mar. 31, 2020 USD ($) MMBTU Unit Product $ / shares $ / MMBTU $ / EquityUnit shares	Mar. 31, 2019 USD ($)	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($) shares
Operations And Summary Of Significant Accounting Policies [Line Items]
Derivative contracts settlement frequency		monthly
Cash flow hedges derivative instruments | $		$ 0
Stock-based compensation expense recognized | $		$ 1,430,000	$ 648,000
Number of primary products | Product		2
Contract cash settlement max days		25 days
Contract cancellable notice term		30 days
Accounts Receivable related to satisfied performance obligations and unconditional right to consideration | $		$ 83,594,000			$ 120,111,000
ASC 326
Operations And Summary Of Significant Accounting Policies [Line Items]
Cumulative-effect adjustment | $				$ 0
Restricted Stock
Operations And Summary Of Significant Accounting Policies [Line Items]
Shares of unvested restricted stock outstanding | shares		1,060,248			1,092,309
Weighted average grant date fair value of stock grants per share | $ / shares		$ 6.10
Unrecognized compensation cost related to unvested restricted stock | $		$ 4,600,000
Period in which compensation cost expected to be recognized		2 years
Potential Performance Shares (PSU)
Operations And Summary Of Significant Accounting Policies [Line Items]
Period in which compensation cost expected to be recognized		2 years 1 month 6 days
Number of performance stock units ("PSUs") outstanding | Unit		904,400
Weighted average grant date fair value of PSUs per unit | $ / EquityUnit		9.58
Minimum final number of shares of common stock issuable based on performance multiplier | shares		0
Maximum final number of shares of common stock issuable based on performance multiplier | shares		1,808,800
Unrecognized expense, performance share units | $		$ 5,600,000
General and Administrative Expense
Operations And Summary Of Significant Accounting Policies [Line Items]
Stock-based compensation expense recognized | $		$ 1,400,000	$ 600,000
Natural Gas Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU		141,106,030
Average price | $ / MMBTU		2.66
Basis Swap Contracts
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU		42,050,000
Fair value of derivative net asset | $		$ 1,900,000
Derivative contracts settlement, month and year		2022-12
Swap Contracts for 2021 | Natural Gas Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU		62,883,140
Average price | $ / MMBTU		2.57
Swap Contracts for 2022 | Natural Gas Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU	10,950,000
Average price | $ / MMBTU	2.53
Subsequent Event | Swap Contracts for Q4 | Natural Gas Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU	2,300,000
Average price | $ / MMBTU	2.60
Subsequent Event | Swap Contracts for Q4 | Natural Gas Collars Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU	4,600,000
Ceiling, Average price | $ / MMBTU	3.01
Floor, Average price | $ / MMBTU	2.50
Subsequent Event | Swap Contracts for 2021 | Natural Gas Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU	56,100,000
Average price | $ / MMBTU	2.54
Subsequent Event | Swap Contracts for 2021 | Natural Gas Collars Contract
Operations And Summary Of Significant Accounting Policies [Line Items]
Volume | MMBTU	54,750,000
Ceiling, Average price | $ / MMBTU	2.94
Floor, Average price | $ / MMBTU	2.43
Subsequent Event | Interest Rate Swap Contracts
Operations And Summary Of Significant Accounting Policies [Line Items]
Outstanding under the bank credit facility | $	$ 500,000,000
Subsequent Event | Interest Rate Swap Contracts | LIBOR
Operations And Summary Of Significant Accounting Policies [Line Items]
Outstanding bank credit facility percentage	0.33%