Earnings per Share - Additional Information (Detail) - shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Earnings Per Share [Abstract] | |||
| Options and restricted stock units excluded from diluted earnings per share because the effect of these options and restricted stock units was antidilutive | 20,625 | 95,600 | 407,985 |