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Stock Compensation Plans - Time-Based Restricted Stock Activity (Detail) - Time Based Restricted Stock [Member] - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Share Based Compensation Restricted Stock Units Award Activity [Line Items]
Shares outstanding beginning balance	414
Shares vested	(121)
Shares awarded	30
Shares forfeited	(47)
Shares outstanding ending balance	276	414
Weighted average remaining term (Years) beginning balance	1 year 11 months 19 days	2 years 11 months 16 days
Aggregate intrinsic value, Beginning balance	$ 6,926
Aggregate intrinsic value, Shares vested	1,902
Aggregate intrinsic value, Shares awarded	505
Aggregate intrinsic value, Shares forfeited	800
Aggregate intrinsic value, Ending balance	$ 3,767	$ 6,926

X

- 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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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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X

- Definition

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

+ References

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- Definition

Share Based Compensation Arrangement By Share Based payment award equity instruments other than options awarded in period.

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