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%

Percentage of fair value of noncontrolling interest in combined effective discount.

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Percentage of fair value of noncontrolling interest of for lack of control.

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Percentage of fair value of non-controlling interest of appraised value.

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Percentage of fair value of non-controlling interest of lack of marketability.

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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