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Compensation - Activity Associated with Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Units, Balance outstanding at beginning of period	4,478,000	929,000	1,063,000
Number of Units, Granted	6,618,000	4,283,000	578,000
Number of Units, Delivered	(1,579,000)	(464,000)	(553,000)
Number of Units, Forfeited	(557,000)	(270,000)	(159,000)
Number of Units, Balance outstanding at end of period	8,960,000	4,478,000	929,000	1,063,000
Weighted-Average Grant Date Fair Value, Balance outstanding at beginning of period	$ 5.25	$ 10.83	$ 9.08
Weighted-Average Grant Date Fair Value, Granted	3.25	4.61	12.05
Weighted-Average Grant Date Fair Value, Delivered	5.79	10.11	8.59
Weighted-Average Grant Date Fair Value, Forfeited	4.11	5.99	11.34
Weighted-Average Grant Date Fair Value, Balance outstanding at end of period	$ 3.75	$ 5.25	$ 10.83	$ 9.08
Fair Value, Balance outstanding at beginning of period	$ 23,516	$ 10,058	$ 9,651
Fair Value, Granted	21,506	19,764	6,964
Fair Value, Delivered	(9,148)	(4,692)	(4,753)
Fair Value, Forfeited	(2,292)	(1,614)	(1,804)
Fair Value, Balance outstanding at end of period	$ 33,582	$ 23,516	$ 10,058	$ 9,651
Weighted-Average Remaining Contractual Term (Years)	1 year 11 months 19 days	2 years 6 months	1 year 9 months	1 year 7 months 17 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 granted in period fair value.

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

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