Earnings Per Share - Additional Information (Detail) - shares |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Stock options | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Stock options not included in computation of diluted earnings per share | 1,191,744 | 1,366,256 |
Restricted stock units | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Stock options not included in computation of diluted earnings per share | 296,058 | 821,756 |