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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 4 Months Ended
--- | --- | ---
May 31, 2013 | Apr. 22, 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 |
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 |  | $ 0.3
Expected weighted-average period to recognize compensation cost (years) |  | 4 months 13 days
Deferred Stock Activity | Maximum |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Intrinsic value of shares vested |  | $ 0.3
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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