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Summary of Significant Accounting Policies - Additional Information 2 (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Customer Counterparty | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts on accounts receivable | $ 7,111 | $ 5,559 |
Number of customers accounted more than 10% of total oil and gas revenues | Customer | 1 | 1 | 1
Net derivative asset | $ 28,200 |  |
Number of counterparties | Counterparty | 5 |  |
Number of financial institutions included in counter parties | Counterparty | 19 |  |
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 |

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