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Stock Repurchase Program - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended
	May 08, 2013	Dec. 31, 2013
Equity [Abstract]
Share repurchase program, authorized amount	$ 50,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount
Stock repurchased amount		$ 39,500,000us-gaap_StockRepurchasedDuringPeriodValue

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- Details

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Namespace Prefix:	us-gaap_
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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

+ Details

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Balance Type:	debit
Period Type:	duration

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- Definition

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

+ References

No definition available.

+ Details

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