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Capital - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 18 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jan. 28, 2014 | Jan. 29, 2013 | Jun. 19, 2012
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Announcement of common stock repurchase program |  |  | $ 25.0us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  | $ 50.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
Number of shares authorized to be repurchased |  |  |  | 25,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased |
Stock repurchased (in shares) |  | 13,734,185us-gaap_StockRepurchasedDuringPeriodShares |  |  |
Average price per share | $ 7.31us-gaap_TreasuryStockAcquiredAverageCostPerShare |  |  |  |

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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 Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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