Stock-Based Compensation - Stock Option Activity and Related Information (Detail) |
9 Months Ended |
|---|---|
|
Sep. 30, 2016
$ / shares
shares
| |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | |
| Shares, Outstanding at Beginning of Period | shares | 3,000 |
| Shares, Granted | shares | 0 |
| Shares, Exercised | shares | 3,000 |
| Shares, Forfeited | shares | 0 |
| Shares, Options Exercisable | shares | 0 |
| Weighted average exercise price per share, Outstanding at Beginning of Period | $ / shares | $ 10.97 |
| Weighted average exercise price per share, Granted | $ / shares | 0 |
| Weighted average exercise price per share, Exercised | $ / shares | 10.97 |
| Weighted average exercise price per share, Forfeited | $ / shares | 0 |
| Weighted average exercise price per share, Options Exercisable | $ / shares | $ 0 |