Stock-Based Compensation - Summary of Restricted Stock Activity (Details) - $ / shares shares in Thousands	3 Months Ended	12 Months Ended
Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2019
Restricted Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested restricted stock awards or restricted stock units, Beginning Balance	1,409	1,409
Granted	0	0	0
Vested	(470)	0
Forfeited	0	0
Nonvested restricted stock awards or restricted stock units, Ending Balance	939	1,409
Restricted Stock Units for Class A Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested restricted stock awards or restricted stock units, Beginning Balance	3,325	2,790
Granted	618	647
Vested	(118)	(95)
Forfeited	(67)	(17)
Nonvested restricted stock awards or restricted stock units, Ending Balance	3,758	3,325
Restricted Stock Units for Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested restricted stock awards or restricted stock units, Beginning Balance	7,185	7,698
Granted	0	0
Vested	(513)	(513)
Forfeited	0	0
Nonvested restricted stock awards or restricted stock units, Ending Balance	6,672	7,185
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Nonvested restricted stock awards or restricted stock units, Weighted Average Grant Date Fair Value, Beginning Balance	$ 28.05	$ 26.74
Granted, Weighted Average Grant Date Fair Value	37.86	44.12
Vested, Weighted Average Grant Date Fair Value	18.68	29.12
Forfeited, Weighted Average Grant Date Fair Value	36.61	42.31
Nonvested restricted stock awards or restricted stock units, Weighted Average Grant Date Fair Value, Ending Balance	$ 29.44	$ 28.05

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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