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Summary of Significant Accounting Policies - Additional Information 2 (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) Customer Counterparty | Dec. 31, 2017 USD ($) Customer | Dec. 31, 2016 Customer
Accounting Policies [Abstract] |  |  |
Allowance for doubtful accounts on accounts receivable | $ | $ 6,118 | $ 7,111 |
Number of customers accounted more than 10% of total oil and gas revenues | Customer | 1 | 1 | 1
Net derivative asset | $ | $ 9,700 |  |
Number of counterparties | Counterparty | 4 |  |
Number of financial institutions included in counter parties | Counterparty | 20 |  |

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- Definition Number of customers accounted more than ten percent of total oil and gas revenues. + References No definition available. + Details
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- Definition Number of financial institutions included in counterparties. + References No definition available. + Details
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- Definition A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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