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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2013 | Oct. 07, 2017 | Oct. 07, 2017
Chief Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock award | $ 1.3 |  |
Restricted shares issued | 58,500 |  |
Restricted Stock Award | Chief Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted shares per share | $ 22.25 |  |
Restricted stock award vested price |  | $ 18.48 | $ 18.48
Deferred Stock Activity |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost related to nonvested restricted stock granted by the Omnibus Plan |  | $ 1.0 | $ 1.0
Expected weighted-average period to recognize compensation cost (years) |  |  | 7 months 10 days
Intrinsic value of shares vested |  | $ 2.8 | $ 2.8
Annual Grants | Deferred and restricted stock | Non Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate shares elected to receive |  |  | 77,220
Annual Grants | Deferred and restricted stock | Non Employee Directors | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  |  | 1 year
Retainer Conversion |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Retainers conversion into deferred shares |  |  | 100.00%
Vesting period |  |  | 1 year
Director Retainer Deferrals | Omnibus Plan | Deferred and restricted stock | Non Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate shares elected to receive |  |  | 10,020

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