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Stock Repurchase Program - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Nov. 30, 2011 | Apr. 30, 2008 | Jun. 30, 2013 | Jun. 30, 2013
Equity [Abstract] |  |  |  |
Repurchase of authorized common stock | $ 80,000,000 | $ 50,000,000 |  |
Repurchase of shares |  |  | 1,643,875 | 1,643,875
Repurchase of shares during period |  |  | 268,000 |
Repurchase of shares, Value |  |  | 41,891,000 | 41,891,000
Repurchase of shares during period, Value |  |  | 11,891,000 | 11,891,000
Repurchase of remaining shares, Value |  |  |  | $ 8,109,000

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- Definition Stock repurchased to date two thousand eight plan. + References No definition available. + Details
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- Definition Stock repurchased value to date two thousand eight plan. + References No definition available. + Details
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- Definition Stock repurchase program remaining authorized repurchase amount under two thousand eight plan. + References No definition available. + Details
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- Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern 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 -Article 5 + Details
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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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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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