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Stock-Based Compensation - Summary of Changes in Outstanding SARs (Detail) (Stock Appreciation Rights (SARs) [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of SARs, Beginning balance	110,593	115,187	135,409
Number of SARs, Granted
Number of SARs, Exercised
Number of SARs, Forfeited		(4,594)	(20,222)
Number of SARs, Ending balance	110,593	110,593	115,187
SARs Exercisable, Ending balance	110,593	110,593	115,187
Weighted-average exercise price per share, Beginning balance	$ 20.00	$ 20.00	$ 20.00
Weighted-average exercise price per share, Ending balance	$ 20.00	$ 20.00	$ 20.00
Weighted-Average Exercise Price, Ending balance	$ 20.00	$ 20.00	$ 20.00

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Non Option Equity Instruments Exercisable Number

+ References

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- Definition

Share based compensation arrangement by share based payment award non option equity instruments exercisable weighted average exercise price.

+ References

No definition available.

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- Definition

Share based compensation arrangement by share based payment award non option equity instruments outstanding weighted average exercise price.

+ References

No definition available.

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- Definition

Number of non-option equity instruments exercised by participants.

+ 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)(2)

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

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- Definition

Number of shares under non-option equity instrument agreements that were either cancelled or expired.

+ 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)-(4)

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

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- Definition

Net number of non-option equity instruments granted to participants.

+ 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)(1)

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

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ 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)(i)

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



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-Name Accounting Standards Codification

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-Section 50

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

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