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Stock-Based Compensation - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 20, 2013 shares | Dec. 31, 2015 USD ($) Incentive_Plan $ / shares shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Equity incentive plans | Incentive_Plan |  | 2 |  |
Term of years |  | 5 years 8 months 12 days | 4 years 2 months 12 days | 5 years 1 month 6 days
Total unrecognized compensation expense | $ |  | $ 5,924,000 |  |
Vesting period |  | 1 year 8 months 12 days |  |
Options granted |  | 2,595,000 | 0 | 0
Intrinsic value of options at time of exercise | $ |  |  |  | $ 2,214
Options exercised |  | 0 | 0 | (3,452)
Exercise price | $ / shares |  | $ 12.14 |  |
Equity Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares available for grant | 6,000,000 | 6,207,871 |  |
Annual increase in number of shares of common stock |  | 4.00% |  |
Aggregate limit of shares issuable to incentive stock option awards |  | 3,000,000 |  |
Increase in percentage of outstanding number of shares of common stock | 4.00% |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of years |  | 10 years |  |
Exercise price | $ / shares |  | $ 20 |  |
Percentage of vested grant yearly |  | 25.00% |  |
Percentage of vested grant monthly |  | 75.00% |  |
Number of SARs, Granted |  | 0 |  |
Number of SARs, Exercised |  | 0 |  |
Number of SARs, Forfeited |  | 0 |  |
Vesting period of grant date |  | 3 years |  |
Reduced compensation expense | $ |  | $ 0 | $ 0 | $ 0
Restricted Stock [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of years |  | 10 years |  |
Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unexercised vested option forfeiture |  | 3 months |  |
Estimated fair value | $ |  | $ 59,000 | $ 138,000 | $ 406,000
Options [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Term of years |  | 10 years |  |

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