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Compensation - Activity Associated with Restricted Stock Units (Detail) - Restricted Stock Units - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	8,960,000
Granted (in shares)	4,658,000
Delivered (in shares)	(2,572,000)
Forfeited (in shares)	(245,000)
Ending balance (in shares)	10,801,000	8,960,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share)	$ 3.75
Granted (in dollars per share)	4.30
Delivered (in dollars per share)	4.04
Forfeited (in dollars per share)	3.84
Ending balance (in dollars per share)	$ 3.92	$ 3.75
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Outstanding [Roll Forward]
Beginning balance	$ 33,582
Granted	20,044
Delivered	(10,385)
Forfeited	(940)
Ending balance	$ 42,301	$ 33,582
Weighted- Average Remaining Contractual Term (Years)	2 years 7 months 24 days	2 years 5 months 15 days

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options fair value.

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Fair Value Outstanding

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Share based compensation arrangement by share based payment award equity instruments other than options forfeitures in period fair value.

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- Definition

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 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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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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