Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Restricted Stock Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	2,792,438	1,800,000
Granted, weighted average grant date fair value	$ 10.59	$ 16.97
Vesting period	3 years
Stock-based compensation expense	$ 18.9	$ 18.2
Restricted Stock Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	1,206,480
Granted, weighted average grant date fair value	$ 10.20
Stock-based compensation expense	$ 7.0	$ 11.0
Restricted Stock Liability Awards \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	1,000,000.0	877,000
Granted, weighted average grant date fair value	$ 10.39	$ 15.30
Vesting period	3 years	3 years
Restricted Stock Liability Awards \| Non-Employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	183,000	138,000
Granted, weighted average grant date fair value	$ 9.11	$ 15.54

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

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-Name Accounting Standards Codification
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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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