Stock Awards - Restricted Equity Awards Activity (Detail) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Vesting Based on Service [Member]
Employee Restricted Equity Awards Vesting Activity [Line Items]
Nonvested awards at beginning of the year, Shares	276,280	347,128
Awarded, Shares	958,480	249,841
Vested, Shares	(307,275)	(304,613)
Forfeited, Shares	(3,637)	(16,076)
Nonvested awards at end of year, Shares	923,848	276,280
Nonvested awards at beginning of the year, Weighted Average Value at Award Date	$ 12.68	$ 13.35
Awarded, Weighted Average Value at Award Date	14.31	12.40
Vested, Weighted Average Value at Award Date	12.92	12.86
Forfeited, Weighted Average Value at Award Date	13.05	12.75
Nonvested awards at end of year, Weighted Average Value at Award Date	$ 14.29	$ 12.68
Vesting Based on Market/Performance Conditions [Member]
Employee Restricted Equity Awards Vesting Activity [Line Items]
Nonvested awards at beginning of the year, Shares	2,676,755	1,811,675
Awarded, Shares	1,750,834	1,741,003
Vested, Shares	(288,404)	(491,071)
Forfeited, Shares	(5,750)	(384,852)
Nonvested awards at end of year, Shares	4,133,435	2,676,755
Nonvested awards at beginning of the year, Weighted Average Value at Award Date	$ 7.86	$ 6.78
Awarded, Weighted Average Value at Award Date	11.61	8.21
Vested, Weighted Average Value at Award Date	11.25	6.84
Forfeited, Weighted Average Value at Award Date	9.35	5.65
Nonvested awards at end of year, Weighted Average Value at Award Date	$ 9.21	$ 7.86

Employee Restricted Equity Awards Vesting Activity [Line Items]

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period Weighted Average Grant Date Fair Values

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
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- Definition

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).

+ References

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-Publisher FASB
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-SubTopic 10
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-Paragraph 2
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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).

+ References

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-Publisher FASB
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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