Earnings per Common Share - Additional Information (Detail) shares in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
shares
| |
| Restricted Stock Units [Member] | |
| Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] | |
| Anti-dilutive securities excluded from computation of earnings per share, amount | 118,773 |