Non-Vested Stock Option Activity (Detail) - Stock Option [Member] |
12 Months Ended |
|---|---|
|
Dec. 31, 2015
$ / shares
shares
| |
| Share Based Compensation [Line Items] | |
| Non-vested stock options beginning balance | shares | 250,000 |
| Granted | shares | 590,647 |
| Vested | shares | (62,500) |
| Forfeited | shares | (2,153) |
| Non-vested stock options ending balance | shares | 775,994 |
| Non-Vested Stock Options Begining Balance, Weighted Average Grant Date Fair Value | $ / shares | $ 26.65 |
| Non-Vested Stock Options Granted, Weighted Average Grant Date Fair Value | $ / shares | 31.73 |
| Non-Vested Stock Options Vested, Weighted Average Grant Date Fair Value | $ / shares | 26.65 |
| Non-Vested Stock Options Forfeited, Weighted Average Grant Date Fair Value | $ / shares | 43.63 |
| Non-Vested Stock Options Ending Balance, Weighted Average Grant Date Fair Value | $ / shares | $ 30.47 |