Equity - Additional Information - 2004 Equity Incentive Plan (Detail) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Maximum number of shares of common stock reserved for issuance |
|
917,046
|
|
| Restricted stock units |
145,979
|
34,292
|
114,821
|
| Stock Options [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Maximum number of shares eligible under share based compensation plan by individual within a year |
|
15,000
|
|
| Restricted Stock [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Maximum number of shares eligible under share based compensation plan by individual within a year |
|
20,000
|
|
| Stock Appreciation Rights [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Maximum number of shares eligible under share based compensation plan by individual within a year |
|
20,000
|
|
| Performance Shares [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Maximum number of shares eligible under share based compensation plan by individual within a year |
|
10,000
|
|
| Restricted Stock Units [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Restricted stock units |
145,979
|
34,292
|
114,821
|
| Compensation expense related to restricted stock units |
$ 1,270
|
$ 875
|
$ 445
|
| Restricted Stock Units [Member] | 2016 [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Compensation expense related to restricted stock units |
784
|
|
|
| Restricted Stock Units [Member] | 2017 [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Compensation expense related to restricted stock units |
387
|
|
|
| Restricted Stock Units [Member] | 2018 [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Compensation expense related to restricted stock units |
$ 0
|
|
|