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Share Repurchases - Additional Information (Detail) (USD $) | 8 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2012 | May 01, 2014
Equity [Abstract] |  |  |  |
Authorized a share repurchase under a stock repurchase plan | $ 50,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 | $ 50,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  | $ 25,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1
Share repurchase program expiration date |  | May 01, 2016 |  |
Repurchases, shares | 755,310 us-gaap_StockRepurchasedDuringPeriodShares | 464,190 us-gaap_StockRepurchasedDuringPeriodShares | 374,000 us-gaap_StockRepurchasedDuringPeriodShares |
Repurchases, amount | $ 16,627,000 us-gaap_StockRepurchasedDuringPeriodValue | $ 12,200,000 us-gaap_StockRepurchasedDuringPeriodValue |  |

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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 stock repurchase plan authorized. + References No definition available. + Details
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- Definition Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format. + References No definition available. + Details
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