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Capital Stock, Treasury Stock and Additional Paid-in Capital - Additional Information (Detail) - USD ($) |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Aug. 12, 2014 | May 07, 2014 | Feb. 14, 2014 | Apr. 30, 2013 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Feb. 26, 2015 | Nov. 26, 2014 | Mar. 22, 2010
Stockholders' Equity Note [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 15,000,000
Stock repurchased during period, share |  |  |  |  |  |  |  |  |  |  |  |  | 1,205,229 |  |  |
Treasury stock acquired, average cost per share | $ 6.30 |  |  |  |  |  |  | $ 3.10 | $ 5.46 |  |  | $ 4.05 | $ 5.21 |  |  |
Treasury stock, shares, acquired | 843,022 |  |  |  |  | 0 | 0 | 657,113 | 2,372,097 | 0 | 0 | 551,646 |  |  |  |
Stock issued during period, shares, new issues |  | 3,500,000 | 4,476,195 | 3,398,558 | 11,500,000 |  |  |  |  |  |  |  |  |  |  |
Common stock, par or stated value per share |  | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |  |
Sale of stock, price per share |  | $ 10.00 | $ 10.50 | $ 9.71 | $ 10.00 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance or sale of equity, total |  | $ 35,000,000 | $ 47,000,047 | $ 32,999,998 | $ 115,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of equity, net of issuance costs |  | $ 34,071,501 | $ 46,294,133 | $ 31,937,044 | $ 109,119,029 |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount, additional |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 |  |

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