Computation of Earnings Per Share - Additional Information (Detail) - shares |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
| Stock Options [Member] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Restricted share units excluded from calculation of diluted earnings (loss) per share | 47,850 | 59,750 | 55,350 | 51,850 |
| Restricted Stock [Member] | ||||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||||
| Restricted share units excluded from calculation of diluted earnings (loss) per share | 0 | 0 | 0 | 0 |