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Summary of Significant Accounting Policies - Additional Information 2 (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($) Customer Counterparty | Dec. 31, 2014 USD ($) Customer | Dec. 31, 2013 Customer
Summary Of Significant Accounting Policies [Line Items] |  |  |
Allowance for doubtful accounts | $ 5.0 | $ 2.7 |
Number of customers accounted more than 10% of total oil and gas revenues | Customer | 1 | 4 | 4
Net derivative asset | $ 11.5 |  |
Number of counterparties | Counterparty | 4 |  |
Total Number of Derivative Counterparties | Counterparty | 17 |  |
Accounting Standards Update 2015-04 | Subordinated Debt |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Prior period reclassification |  | $ 32.4 |
Accounting Standards Update 2015-04 | Bank Credit Facility |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Prior period reclassification |  | 9.8 |
Accounting Standards Update 2015-11 |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Prior period reclassification |  | $ 115.6 |

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