Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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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No definition available.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Equity-Based Compensation - Additional Information (Detail) - USD ($) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Continuing Operations [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense recognized	$ 4,000,000	$ 1,000,000	$ 6,000,000	$ 2,000,000
Discontinued Operations [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity-based compensation expense recognized	$ 0	$ 1,000,000	$ 0	$ 4,000,000
Common Stock [Member] \| Omnibus Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized for issuance	8		8
Share-based compensation arrangement by share-based payment award, number of shares available for issuance	6		6
Minimum [Member] \| PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			2 years
Minimum [Member] \| RSAs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years
Minimum [Member] \| RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years
Maximum [Member] \| PSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			3 years
Maximum [Member] \| RSAs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			4 years
Maximum [Member] \| RSUs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period			4 years