Stock Option Activity (Detail) - $ / shares
|
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Share Based Compensation [Line Items] |
|
|
| Forward Interest Rate, Minimum |
1.46%
|
|
| Forward Interest Rate, Maximum |
1.93%
|
|
| Expected Volatility Rate, Maximum |
58.05%
|
|
| Expected Volatility Rate, Minimum |
53.87%
|
|
| Stock Option [Member] |
|
|
| Share Based Compensation [Line Items] |
|
|
| Number of Options Outstanding, Beginning Balance |
277,536
|
|
| Stock Options Granted, Number of Shares |
590,647
|
250,000
|
| Stock Options Exercised, Number of Shares |
(15,380)
|
|
| Stock Options Canceled, Forfeited or Expired, Number of Shares |
(14,309)
|
|
| Number of Options Outstanding, Ending Balance |
838,494
|
277,536
|
| Stock Options Exerciseable, Number of Shares |
62,500
|
|
| Options Outstanding, Beginning Balance, Weighted Average Exercise Price |
$ 26.40
|
|
| Stock Options Granted, Weighted Average Exercise Price |
31.73
|
|
| Stock Options Exercised, Weighted Average Exercise Price |
25.93
|
|
| Stock Options Canceled, Forfeited or Expired, Weighted Average Exercise Price |
25.16
|
|
| Options Outstanding, Ending Balance, Weighted Average Exercise Price |
$ 30.18
|
$ 26.40
|
| Options Outstanding, Weighted Average Contractual Life |
9 years 3 months 22 days
|
8 years 11 months 26 days
|
| Stock Options Exerciseable, Weighted Average Exercise Price |
$ 26.65
|
|
| Stock Options Exerciseable, Weighted Average Contractual Life |
8 years 11 months 16 days
|
|
| Stock Option [Member] | Maximum [Member] |
|
|
| Share Based Compensation [Line Items] |
|
|
| Expected Term |
6 years 9 months 4 days
|
|
| Fair Value |
$ 23.21
|
|
| Stock Option [Member] | Minimum [Member] |
|
|
| Share Based Compensation [Line Items] |
|
|
| Expected Term |
5 years 6 months
|
|
| Fair Value |
$ 13.45
|
|