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Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |  |  |  | 6 Months Ended |
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Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member] | Jun. 30, 2013 Restricted Stock [Member] | Jun. 30, 2012 Restricted Stock [Member] | Mar. 31, 2013 Restricted Stock [Member] | Dec. 31, 2012 Restricted Stock [Member] | Mar. 31, 2012 Restricted Stock [Member] | Dec. 31, 2011 Restricted Stock [Member] | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | Jun. 30, 2013 Omnibus Incentive Plan New Plan 2012 [Member] | Jun. 30, 2013 Omnibus Incentive Plan New Plan 2012 [Member] Restricted Stock [Member] | Jun. 30, 2013 2007 Stock Option and Incentive Plan (Prior Plan) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Common shares available for grant | 4,411,760 |  |  | 4,411,760 |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |
Number of restricted shares outstanding |  |  |  |  |  | 732,240 | 200,000 | 732,240 | 200,000 | 245,400 | 246,320 | 0 | 0 |  |  |  | 588,240 |
Stock options granted, vesting period range |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Stock options granted, vesting period, high end of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Exercise of common stock options, shares |  |  | 217,003 |  | 217,003 |  |  |  |  |  |  |  |  |  |  |  |  |
Surrender of Shares |  |  |  |  | 71,409 |  |  |  |  |  |  |  |  |  |  |  |  |
Recognized compensation expenses | $ 5 | $ 6 |  | $ 9 | $ 59 | $ 1,080 | $ 153 | $ 1,465 | $ 153 |  |  |  |  |  |  |  |  |
Unrecognized compensation expenses related to nonvested stock options | 15 |  |  | 15 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition of remaining compensation expense over a weighted-average period |  |  |  | 10 months |  |  |  | 30 months |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation expense, Nonvested restricted stock arrangements granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,364
Tax benefit from restricted stock dividends |  |  |  | $ 280 | $ 437 | $ 61 |  | $ 83 |  |  |  |  |  |  |  |  |  |

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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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