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Stock-Based Compensation (Deferred and Restricted Stock) - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
May 31, 2013 | Dec. 31, 2016 | Jan. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period |  | 1 year |
Chief Executive Officer |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock award | $ 1.3 |  |
Restricted shares issued | 58,500 |  |
Deferred Stock | Distributed to director who retired on May 21, 2014 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of deferred compensation (in shares) |  |  | 105,621
Deferred Stock | Distributed to director who retired on December 31, 2014 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of deferred compensation (in shares) |  |  | 46,364
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 EPIP |  | $ 0.7 |
Expected weighted-average period to recognize compensation cost (years) |  | 4 months 24 days |
Fair value at vesting |  | $ 1.3 |
Omnibus Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Retainers conversion into deferred shares |  | 100.00% |
Vesting period |  | 1 year |
Omnibus Plan | Deferred Stock | Non Employee Directors | Common Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of deferred compensation (in shares) |  | 2,380 |
Annual Grants | Deferred Stock | Non Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Issuance of deferred compensation (in shares) |  | 111,868 |
Annual Grants | Deferred and restricted stock | Non Employee Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Aggregate shares converted |  | 95,314 |
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 |  | 130.00% |
Vesting period |  | 2 years |

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