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Summary of Significant Accounting Policies - Additional Information 2 (Detail) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) Customer Counterparty | Dec. 31, 2015 USD ($) Customer | Dec. 31, 2014 Customer | Dec. 31, 2017 MMBTU / d bbl / d $ / Mcf $ / bbl
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Allowance for doubtful accounts on accounts receivable | $ 5,559 | $ 4,994 |  |
Number of customers accounted more than 10% of total oil and gas revenues | Customer | 1 | 1 | 4 |
Net derivative asset | $ 16,800 |  |  |
Number of counterparties | Counterparty | 5 |  |  |
Total Number of Derivative Counterparties | Counterparty | 22 |  |  |
Accounting Standards Update 2016-09 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Recognition of an excess tax deficiency in provision for income taxes rather than paid-in capital | $ 2,100 |  |  |
Cumulative-effect adjustments to retained earnings (deficit) and reduced deferred tax liability | $ 101,100 |  |  |
Natural Gas | Scenario Forecast | Counterparty One |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Derivative contract volumes | MMBTU / d |  |  |  | 6,575
Natural Gas | Minimum | Scenario Forecast | Counterparty One |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Price used for calculating margin requirement | $ / Mcf |  |  |  | 4.43
Crude Oil | Scenario Forecast | Counterparty One |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Derivative contract volumes | bbl / d |  |  |  | 608
Crude Oil | Minimum | Scenario Forecast | Counterparty One |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Price used for calculating margin requirement | $ / bbl |  |  |  | 83.20

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