Incentive Compensation Plan - Additional Information (Detail) (USD $)
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0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | ||||||||||||||||||
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Jan. 28, 2013
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Feb. 24, 2012
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Jan. 17, 2011
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2013
Restricted Stock [Member]
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Dec. 31, 2012
Restricted Stock [Member]
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Dec. 31, 2011
Restricted Stock [Member]
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Aug. 16, 2013
Executive [Member]
Restricted Stock [Member]
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May 31, 2013
Executive [Member]
Restricted Stock [Member]
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Mar. 01, 2013
Executive [Member]
Restricted Stock [Member]
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Jan. 28, 2013
Executive [Member]
Restricted Stock [Member]
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Jan. 02, 2012
Executive [Member]
Restricted Stock [Member]
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Apr. 01, 2011
Executive [Member]
Restricted Stock [Member]
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Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
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Nov. 21, 2011
Executive [Member]
Restricted Stock [Member]
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Jan. 17, 2011
Executive [Member]
Restricted Stock [Member]
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Jan. 22, 2010
Executive [Member]
Restricted Stock [Member]
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Apr. 01, 2008
Executive [Member]
Restricted Stock [Member]
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Nov. 12, 2007
Executive [Member]
Restricted Stock [Member]
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Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Annual Incentive Plan [Member]
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Feb. 24, 2012
Executive [Member]
Restricted Stock [Member]
Long Term Incentive Plan [Member]
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||
Maximum number of shares that are available to be awarded | 5,000,000 | ||||||||||||||||||||||
Common stock issued to executive | 3,000 | 45,000 | 10,000 | 128,611,000 | 100,000 | 25,000 | 68,000,000 | 10,000 | 54,166,000 | 30,120 | 12,654 | 35,000 | 90,000 | 34,000 | |||||||||
Fair value of restricted stock | $ 7.25 | $ 5.65 | $ 6.13 | $ 8.82 | $ 7.57 | $ 7.21 | $ 7.35 | $ 5.26 | $ 6.82 | $ 4.41 | $ 5.70 | $ 12.35 | $ 10.95 | $ 5.96 | $ 5.96 | ||||||||
Expiration of compensation plan | Aug. 16, 2016 | May 31, 2016 | Mar. 01, 2016 | Jan. 01, 2016 | Apr. 01, 2016 | Nov. 21, 2014 | Jan. 22, 2012 | Apr. 01, 2011 | Nov. 12, 2010 | Feb. 24, 2015 | Dec. 31, 2014 | ||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 1 | 3 | 1 | 4 | 1 | 1 | 2 | 3 | 3 | 1 | 1 | ||||||||||||
Compensation expense | $ 509,000 | $ 395,000 | $ 249,000 | ||||||||||||||||||||
Unrecognized compensation cost related to unvested restricted stock | 2,200,000 | ||||||||||||||||||||||
Options granted under plan | 4,500,000 | ||||||||||||||||||||||
Vesting period of restricted stock | 1 year | 1 year | 1 year | 10 years | |||||||||||||||||||
Intrinsic value of stock options exercised | $ 1.41 | $ 1.17 | |||||||||||||||||||||
Options exercised | 0 | 130,672 | 13,760 | ||||||||||||||||||||
Granted, Shares | 0 | 0 | 0 | ||||||||||||||||||||
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 4,330,038 |