Share Repurchase Plan - Additional Information (Detail) - $ / shares |
1 Months Ended | 6 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Jul. 15, 2015 |
May. 31, 2015 |
May. 31, 2014 |
Apr. 08, 2015 |
Nov. 30, 2014 |
Jun. 06, 2012 |
Dec. 31, 2011 |
|
| Equity, Class of Treasury Stock [Line Items] | |||||||
| Number of shares authorized to repurchase | (6,000,000) | (3,000,000) | (1,000,000) | ||||
| Share repurchase plan | Open market purchases, privately negotiated block trades, unsolicited negotiated transactions, and/or pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission | ||||||
| Number of shares repurchased | 2,559,137 | ||||||
| Average price per share (repurchased) | $ 2.37 | ||||||
| Treasury stock, shares | 2,559,137 | 2,215,111 | |||||
| Subsequent Event [Member] | |||||||
| Equity, Class of Treasury Stock [Line Items] | |||||||
| Number of shares repurchased | 469 | ||||||
| Average price per share (repurchased) | $ 2.36 | ||||||
| Common Stock [Member] | |||||||
| Equity, Class of Treasury Stock [Line Items] | |||||||
| Number of shares repurchased | 344,026 | 636,531 | |||||
| Average price per share (repurchased) | $ 2.77 | $ 2.21 | |||||