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Accounting for Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 21, 2020 | May 19, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 16, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance based restricted stock units outstanding |  |  | 34,906 | 34,920 | 136,566 | 282,100 |
Shareholder Return Award Performance Measurement Period |  |  | 3 years |  |  |  |
Unrecognized compensation cost related to non-vested options, restricted stock, restricted stock units and PSUs |  |  | $ 13,604 | $ 13,168 |  |  |
Unrecognized share-based compensation cost recognition period |  |  | 2 years |  |  |  |
Share based compensation expense |  |  | $ 14,323 | 8,589 | $ 12,177 |  |
Deferred tax benefit |  |  | $ 3,002 | $ 1,573 | $ 2,434 |  |
Granted, Shares |  |  | 0 | 0 | 0 |  |
Total intrinsic value of options exercised |  |  | $ 5,317 | $ 1,681 | $ 5,061 |  |
Total fair value of restricted shares vested |  |  | $ 1,499 | $ 3,697 | $ 4,599 |  |
Performance Based Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance based restricted stock units outstanding |  |  | 315,834 |  |  |  |
These awards vesting period |  |  | 3 years |  |  |  |
Stock option achieving minimum threshold |  |  | 50.00% |  |  |  |
Stock option achieving maximum threshold |  |  | 200.00% |  |  |  |
RSU |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance based restricted stock units outstanding |  |  | 524,739 | 331,821 | 215,969 |  |
Total intrinsic value of restricted stock units vested |  |  | $ 2,214 | $ 1,000 | $ 0 |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  | $ 4,164 | $ 1,588 | $ 3,532 |  |
ROIC | Performance Based Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance based restricted stock payment condition |  |  | one-half |  |  |  |
TSR | Performance Based Restricted Stock Units |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Performance based restricted stock payment condition |  |  | one-half |  |  |  |
Employee and Consultants | Minimum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share based compensation, requisite service period |  |  | 3 years |  |  |  |
Employee and Consultants | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share based compensation, requisite service period |  |  | 4 years |  |  |  |
Director |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Share based compensation, requisite service period |  |  | 1 year |  |  |  |
2013 Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for grant |  |  | 3,021,451 |  |  |  |
Number of shares authorized for grant |  |  |  |  |  |  | 3,500,000
Number of increased shares available for grant | 2,450,000 | 2,000,000 |  |  |  |  |
Equity Incentive Plan Twenty Eleven and Two Thousand and Six |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized for grant |  |  |  |  |  |  | 0

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