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Share-Based Payments Summary of Grants, Exchanges and Forfeitures of Restricted Stock and RSUs (Detail) (LTIP [Member], USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Nov. 30, 2013 Restricted Stock [Member] | Apr. 30, 2013 Restricted Stock [Member] | Feb. 28, 2013 Restricted Stock [Member] | Aug. 31, 2012 Restricted Stock [Member] | Apr. 30, 2012 Restricted Stock [Member] | Apr. 30, 2011 Restricted Stock [Member] | Dec. 31, 2013 Restricted Stock [Member] | Dec. 31, 2010 Restricted Stock [Member] | Sep. 30, 2013 RSU Vesting [Member] | Jul. 31, 2013 RSU Vesting [Member] | Jun. 30, 2013 RSU Vesting [Member] | May 31, 2013 RSU Vesting [Member] | Feb. 28, 2013 RSU Vesting [Member] | Oct. 31, 2012 RSU Vesting [Member] | Mar. 31, 2012 RSU Vesting [Member] | Feb. 29, 2012 RSU Vesting [Member] | Dec. 31, 2011 RSU Vesting [Member] | Aug. 31, 2011 RSU Vesting [Member] | Apr. 30, 2011 RSU Vesting [Member] | Dec. 31, 2013 RSU Vesting [Member] | Dec. 31, 2010 RSU Vesting [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forfeiture/Canceled |  |  |  |  |  |  |  |  |  | (5,000) | (5,000) |  |  | 112,084 |  | (1,875) | (30,000) |  |  |  |
Grant | 5,000 | 11,304 | 20,000 | 1,496 | 9,584 | 9,204 | 208,416 | 151,828 | 10,000 |  |  | 15,000 | 180,000 |  | 20,000 |  |  | 308,750 | 5,000 | 503,750 | 118,959
Estimated Fair Value on Grant Date, Exchange | $ 81,000 | $ 200,000 | $ 352,000 | $ 25,000 | $ 150,000 | $ 150,000 |  |  | $ 154,000 |  |  | $ 264,000 | $ 3,166,000 |  | $ 310,000 |  |  | $ 4,586,000 | $ 82,000 |  |

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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