Condensed Consolidated Balance Sheets (Parenthetical) - Solaris Midstream Holdings, LLC and Subsidiaries - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Redeemable Preferred Units Par value (in dollars)	$ 10,000	$ 10,000
Redeemable Preferred Units issued (in shares)	0
Redeemable Preferred Units outstanding (in shares)	0	7,307
Capital Unit, Class A
Units Par value (in dollars)	$ 10	$ 10
Units issued (in shares)	27,797,658	27,797,207
Units outstanding (in shares)	27,797,658	27,797,207
Capital Unit, Class B
Units Par value (in dollars)	$ 10	$ 10
Units issued (in shares)	3,556,051	3,556,051
Units outstanding (in shares)	3,556,051	3,556,051
Capital Unit, Class C
Units Par value (in dollars)	$ 0	$ 0
Units issued (in shares)	878,850	806,350
Units outstanding (in shares)	878,850	806,350
Capital Unit, Class D
Units Par value (in dollars)	$ 10	$ 10
Units issued (in shares)	6,651,100	6,651,100
Units outstanding (in shares)	6,651,100	6,651,100

Stated value of common units of ownership issued by a limited liability company (LLC).

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Number of common units issued of limited liability company (LLC).

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Number of common units of ownership outstanding of a limited liability company (LLC).

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. 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. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Carrying amount of the par value of temporary equity outstanding. 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 put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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