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Equity Incentive Awards - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | May. 31, 2015 | Feb. 28, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based compensation |  |  |  | $ 2,300 | $ 2,600 | $ 6,268 | $ 4,998
Number of shares available for grant |  |  |  | 3,405,794 |  | 3,405,794 |
Management |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights | Full |  | Full |  |  |  |
Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting rights |  | One-third | One-third |  |  |  |
Restricted Stock | Management |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options, grants in period | 3,000 |  | 78,000 |  |  |  |
Fair value of shares issued | $ 200 |  | $ 4,300 |  |  |  |
Equity instruments other than options vesting date | Dec. 31, 2015 |  | Dec. 31, 2015 |  |  |  |
Restricted Stock | Director |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options, grants in period |  | 29,440 | 47,100 |  |  |  |
Fair value of shares issued |  | $ 1,600 | $ 2,600 |  |  |  |
Restricted Stock | Director | Phase One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options vesting date |  | Nov. 12, 2015 | Dec. 31, 2015 |  |  |  |
Restricted Stock | Director | Phase Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options vesting date |  | May 12, 2016 | Dec. 31, 2016 |  |  |  |
Restricted Stock | Director | Phase Three |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Equity instruments other than options vesting date |  | May 12, 2017 | Dec. 31, 2017 |  |  |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares authorized for issuance |  |  |  | 3,750,000 |  | 3,750,000 |

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- Definition Description of the period of time over which a director's right to exercise an award is no longer contingent on the passage of time, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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