Stock-based Compensation Plans - Additional Information 2 (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Restricted Stock Equity Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	1,816,432	883,000
Granted, weighted average grant date fair value	$ 16.97	$ 32.81
Vesting period	3 years
Stock-based compensation expense	$ 18.2	$ 18.1
Restricted Stock Liability Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	877,191
Granted, weighted average grant date fair value	$ 15.30
Stock-based compensation expense	$ 11.0	$ 12.0
Restricted Stock Liability Awards \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted	877,000	451,000
Granted, weighted average grant date fair value	$ 15.30	$ 25.95
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	138,000	90,000
Granted, weighted average grant date fair value	$ 15.54	$ 25.01

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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-Section 50
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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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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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- Definition

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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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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