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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 24, 2017 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 06, 2016
Stockholders Equity [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  | 75,000,000 | 75,000,000 | 75,000,000 |  |
Common stock, par value |  | $ 0.50 | $ 0.50 | $ 0.50 |  |
Preferred stock, shares authorized |  | 5,000,000 | 5,000,000 | 5,000,000 |  |
Preferred stock, par value per share |  | $ 10.00 | $ 10.00 | $ 10.00 |  |
Preferred stock, shares outstanding |  | 0 | 0 | 0 |  |
Dividend paid |  |  |  |  | $ 23,800,000 |
Stock purchased under open market amount |  |  | $ 0 | $ 0 | $ 8,086,000 |
Debt conversion, convertible instrument, principal amount |  | $ 2,100,000 |  |  |  |
Warrants issued to acquire common stock |  |  |  |  |  | 1,917,342
Exercise price of warrants for common stock |  | $ 0.01 | $ 0.01 |  |  | $ 0.01
Warrants exercised |  |  | 1,255,462 |  |  |
Warrants outstanding |  | 661,880 | 661,880 |  |  |
Subsequent Event |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Debt conversion, convertible instrument, principal amount | $ 9,200,000 |  |  |  |  |
Common Stock |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Number of stock purchased under open market |  |  |  |  | 200,000 |
Debt conversion, converted instrument, shares of common stock issued |  | 176,175 |  |  |  |
Warrants exercised |  |  | 1,256,000 |  |  |
Common Stock | Subsequent Event |  |  |  |  |  |
Stockholders Equity [Line Items] |  |  |  |  |  |
Debt conversion, converted instrument, shares of common stock issued | 767,353 |  |  |  |  |

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