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Stock Compensation Plans - Performance Share Activity (Detail) - Performance Shares [Member] - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Nonvested Restricted Stock Units Activities [Line Items]
Shares outstanding beginning balance	316
Shares vested	(100)
Shares awarded	150
Shares outstanding ending balance	366	316
Weighted average remaining term (Years) beginning balance	1 year 7 months 21 days	2 years 1 month 10 days
Aggregate intrinsic value, Beginning balance	$ 8,927
Shares vested	2,479
Shares awarded	4,689
Aggregate intrinsic value, Ending balance	$ 6,123	$ 8,927

X

- 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.

+ 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)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options.

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Schedule Of Nonvested Restricted Stock Units Activities [Line Items]

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- Definition

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Share based compensation arrangement by share based payment award equity instruments other than options grants in period aggregated intrinsic value.

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