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Equity Based Plans - Summary of Stock Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options	38,700	75,840	348,810	723,890
Outstanding Stock Options, Exercise price Lower Limit	$ 12.60	$ 12.51	$ 12.51
Outstanding Stock Options, Exercise price Upper Limit	$ 18.42	$ 18.80	$ 18.80
Exercisable, Exercise price Lower Limit	$ 12.60	$ 12.51	$ 12.51
Exercisable, Exercise price Upper Limit	$ 18.42	$ 18.80	$ 18.80
Weighted Average Remaining Contractual Life	1 year 7 months 6 days	2 years 2 months 12 days	2 years 7 months 6 days	3 years 7 months 6 days
Exercisable	38,700	75,840	348,810
1999 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options	8,700	15,840	17,310
Outstanding Stock Options, Exercise price Lower Limit	$ 12.60	$ 12.60	$ 12.60
Outstanding Stock Options, Exercise price Upper Limit	$ 18.42	$ 18.42	$ 18.42
Exercisable, Exercise price Lower Limit	$ 12.60	$ 12.60	$ 12.60
Exercisable, Exercise price Upper Limit	$ 18.42	$ 18.42	$ 18.42
Weighted Average Remaining Contractual Life	1 year 7 months 6 days	2 years 2 months 12 days	3 years 2 months 12 days
Exercisable	8,700	15,840	17,310
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options	30,000	60,000	251,500
Outstanding Stock Options, Exercise price Lower Limit		$ 12.51	$ 12.51
Outstanding Stock Options, Exercise price Upper Limit	$ 18.42	$ 18.80	$ 18.80
Exercisable, Exercise price Lower Limit		$ 12.51	$ 12.51
Exercisable, Exercise price Upper Limit	$ 18.42	$ 18.80	$ 18.80
Weighted Average Remaining Contractual Life	1 year 7 months 6 days	2 years 2 months 12 days	2 years 10 months 24 days
Exercisable	30,000	60,000	251,500
Inducements [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding stock options			80,000
Outstanding Stock Options, Exercise price Lower Limit			$ 12.75
Outstanding Stock Options, Exercise price Upper Limit			$ 14.32
Exercisable, Exercise price Lower Limit			$ 12.75
Exercisable, Exercise price Upper Limit			$ 14.32
Weighted Average Remaining Contractual Life			1 year 8 months 12 days
Exercisable			80,000

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- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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)(iii)

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

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- Definition

Number of options outstanding, including both vested and non-vested options.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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- Definition

Weighted average remaining contractual term for option awards outstanding, 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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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ 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 (g)

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

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