Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended		3 Months Ended	9 Months Ended
	Jul. 17, 2019	Jan. 31, 2019	Jan. 31, 2018	Sep. 29, 2019	Sep. 29, 2019	Sep. 30, 2018	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award
Minimum age of retirement to be eligible for PRSUs					60 years
Estimated annual dividend amount per share					$ 0.36	$ 0.36
Stock Based Compensation Relating To Retirement Agreement				$ 2.1	$ 2.1
CEO Gregory Beecher [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Date Of Retirement	Jul. 17, 2019
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal annual installments					4 years
Percentage of common stock price paid					100.00%
Stock options term					7 years
Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal annual installments					4 years
Restricted Stock Units | Director
Share-based Compensation Arrangement by Share-based Payment Award
Period of stock granted to employees and executive officers vest in equal annual installments					1 year
Percentage of awards vesting on the first anniversary of grant date					100.00%
TSR Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period			3 years
Minimum years of service for retirement to be eligible for PRSUs					10 years
Restricted stock unit awards granted					0.1	0.1
Weighted average grant date fair value of restricted stock units granted					$ 51.51	$ 54.85
Stock price		$ 37.95					$ 47.70
TSR Performance-Based Restricted Stock Units | Measurement Input, Expected Dividend Payment [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Estimated annual dividend amount per share					$ 0.36	$ 0.36
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved		200.00%
TSR Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved		0.00%
PBIT Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Total shareholder return performance measurement period		3 years
Restricted stock unit awards granted					0.1	0.1
Weighted average grant date fair value of restricted stock units granted					$ 36.88	$ 46.62
PBIT Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved			200.00%
PBIT Performance-Based Restricted Stock Units | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Percentage of vesting of target shares upon performance achieved			0.00%
Service-Based Restricted Stock Units | Employees
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted					0.7	0.6
Weighted average grant date fair value of restricted stock units granted					$ 36.85
Weighted average grant date fair value of restricted stock units granted						$ 46.25
Service-Based Restricted Stock Units | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted						0.1
Weighted average grant date fair value of restricted stock units granted						$ 12.17
Service-Based Restricted Stock Units | Non Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock unit awards granted					0.1	0.1
Weighted average grant date fair value of restricted stock units granted					$ 48.03	$ 35.81
Service-Based Restricted Stock Units | CEO Gregory Beecher [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Description Of Vesting Agreement	unvested time-based restricted stock units and stock options granted prior to 2019 were modified to allow continued vesting; unvested time-based restricted stock units and stock options granted in 2019 were modified to allow continued vesting through January 31, 2023 (the “Non-Competition Period”) in a pro-rated amount based on the number of days that Mr. Beecher was employed during 2019
Service Based Stock Options | Executive Officer
Share-based Compensation Arrangement by Share-based Payment Award
Weighted average grant date fair value of restricted stock units granted					$ 10.61
Number options granted during the period					0.1
Performance Shares | CEO Gregory Beecher [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Description Of Vesting Agreement	unvested, performance-based restricted stock units awarded in 2019 will vest on the date the amount of shares underlying the performance-based restricted stock units are determined in a pro-rated amount of shares based on the number of days that Mr. Beecher was employed during 2019