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Stock-Based Compensation - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Oct. 01, 2016 USD ($) | Sep. 30, 2017 USD ($) Anniversaries Installment | Oct. 01, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options exercise prices as percentage of the market value on the date of the grant |  |  | 100.00% |
Compensation expenses for stock options | $ 0.4 | $ 0.3 | $ 7.9 | $ 7.6
Restricted Stock [Member] | LTIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Portion of restricted stock award vesting on anniversary |  |  | 0.333% |
Eligible age of officer for restricted stock award |  |  | 55 years |
Restricted Stock Units [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to stock | 40.4 |  | $ 40.4 |
Weighted-average recognition period for unrecognized compensation expense related to stock (years) |  |  | 2 years 3 months 19 days |
Number of anniversaries of grant date upon which restricted stock units vest | Anniversaries |  |  | 3 |
Installments in which restricted stock units vest and are converted to common stock | Installment |  |  | 3 |
Compensation expense | 6.1 | 5.7 | $ 32.2 | 28.9
Restricted Stock Units [Member] | AIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Eligible age of officer for restricted stock award |  |  | 55 years |
Amount of annual incentive award payment participant can elect to defer |  |  | 50.00% |
Additional common stock units for election of deferred annual incentive award, percentage |  |  | 25.00% |
Restricted Stock And Restricted Stock Units [Member] | AIP and LTIP [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense related to stock | 1.3 |  | $ 1.3 |
Weighted-average recognition period for unrecognized compensation expense related to stock (years) |  |  | 1 year 10 months 25 days |
Compensation expense | 3.6 | $ 0.7 | $ 11.1 | $ 7.7
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options vesting period |  |  | 3 years |
Stock options term, years |  |  | 10 years |
Unrecognized compensation expense related to stock | $ 2.5 |  | $ 2.5 |
Weighted-average recognition period for unrecognized compensation expense related to stock (years) |  |  | 2 years 2 months 12 days |

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