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Summary of Restricted Stock Grants and PSUs (Detail) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2015		Dec. 31, 2013
Number of Restricted Shares
Granted (shares)	(0.5)
Forfeited (shares)	0.0
Weighted Average Price per Share
Granted (usd per share)	$ 8.66
Forfeited (usd per share)	$ 11.66
Percentage of target shares earned			200.00%
Restricted Stock
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2012 (shares)	0.2
Granted (shares)	(0.1)
Vested (shares)	(0.2)
Outstanding and non-vested, at December 31, 2013 (shares)	0.3
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2012 (usd per share)	$ 8.63
Granted (usd per share)	16.18
Forfeited (usd per share)	8.35
Outstanding and non-vested, at December 31, 2013 (usd per share)	$ 12.70
PSUs [Member]
Number of Restricted Shares
Outstanding and non-vested, at December 31, 2012 (shares)	0.3
Granted (shares)	(0.4)	[1]	(0.2)
Forfeited (shares)	0.0
Outstanding and non-vested, at December 31, 2013 (shares)	0.4
Weighted Average Price per Share
Outstanding and non-vested, at December 31, 2012 (usd per share)	$ 10.89
Granted (usd per share)	11.62
Vested (usd per share)	11.26
Outstanding and non-vested, at December 31, 2013 (usd per share)	$ 15.28
[1] Includes 0.2 million PSUs, representing the effect of the PSUs granted in 2013 being earned at 200% of target. The PSUs granted in 2013 vested on December 31, 2015.

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Percentage Of Target Shares

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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
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-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Name Accounting Standards Codification
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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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