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Equity-based Compensation Plans - Summary of Class B Units' Activity (Parenthetical) (Details) - QLH Class B Profits Interests	12 Months Ended
	Dec. 31, 2020 shares	Dec. 31, 2019 shares	Dec. 31, 2018 shares	Dec. 31, 2017 shares
QLH Class B Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, outstanding, number		163,800	98,090	81,590
QLH Class B Units | Initial Public Offering (IPO)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Concurrent stock split ratio	44
Number of vested units	902,847
Share-based compensation arrangement by share-based payment award, outstanding, number	0
QLH Class B-1 Units | Initial Public Offering (IPO)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, equity Instruments other than options, Grants in Period	6,470,599

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
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Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
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