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Stock Transactions and Unit Redemptions - Summary of Changes in Carrying Amount of FPUs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Stock Transactions Parenthetical Disclosures [Abstract]
Balance at beginning of period	$ 24,706	$ 46,415
Consolidated net income allocated to FPUs	1,942	8,135
Spin-Off		(22,994)
Earnings distributions	(1,942)	(5,399)
FPUs exchanged	(980)	(1,192)
FPUs redeemed	(88)	(259)
Balance at end of period	$ 23,638	$ 24,706

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- Definition

Exchange Of Founding Working Partner Interests

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- Definition

Redemption of founding working partner interests.

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- Definition

The impact on temporary equity associated with the distribution of earnings.

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- Definition

The change in equity as a result of a spin-off transaction (a regular or reverse spin-off) which is based on the recorded amounts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 60
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6406278&loc=d3e26268-112671

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Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.27(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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The portion of net income or loss attributable to temporary equity interest.

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