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Acquisition of PEG Partners, LLC -Additional Information (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 28, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Gain related to the acquisition |  |  | $ 27,067
Fair value of the non-controlling interestFair value of the assets acquired and liabilities of non-controlling interest of appraised value |  | 20.00% |
Fair value of the assets acquired and liabilities of non-controlling interest of lack of marketability |  | 20.00% |
Fair value of the assets acquired and liabilities of non-controlling interest for lack of control |  | 20.00% |
Fair value of the assets acquired and liabilities of non-controlling interest in combined effective discount |  | 36.00% |
PEG Partners LLC [Member] |  |  |
Percentage of Voting Interests Acquired | 80.00% |  |
Liabilities assumed | $ 12,454 |  |
Gain related to the acquisition | 13,126 |  |
Gross amount of accounts receivable | $ 1,584 |  |
Ownership Percentage by Noncontrolling Owners | 20.00% |  |

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