Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Dec. 31, 2016
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	$ 899,200,000		$ 899,200,000		$ 895,500,000
Gross carrying value, Total	406,100,000		406,100,000		367,900,000
Non-amortized trademarks	112,900,000		112,900,000		64,200,000
Accumulated impairment losses	0		$ 0
Weighted-average amortization period (in years)			11 years
Aggregate amortization expense	6,500,000	$ 6,200,000	$ 13,600,000	$ 12,300,000
Estimated annual amortization expense for fiscal period 2017	26,900,000		26,900,000
Estimated annual amortization expense for fiscal period 2018	24,400,000		24,400,000
Estimated annual amortization expense for fiscal period 2019	21,300,000		21,300,000
Estimated annual amortization expense for fiscal period 2020	17,600,000		17,600,000
Estimated annual amortization expense for fiscal period 2021	14,400,000		14,400,000
Estimated annual amortization expense for fiscal period 2022	9,600,000		9,600,000
Repair Systems & Information Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	600,400,000		600,400,000		640,600,000
Commercial & Industrial Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	286,300,000		286,300,000		242,400,000
BTC [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	5,900,000		5,900,000
Car-O-Liner Holding AB [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	66,100,000		66,100,000
Car-O-Liner Holding AB [Member] | Repair Systems & Information Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	65,200,000		65,200,000
Car-O-Liner Holding AB [Member] | Commercial & Industrial Group [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	900,000		900,000
Car-O-Liner Holding AB [Member] | Trademarks [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total			28,900,000
Ryeson Corporation [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	5,000,000		5,000,000
Norbar [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Goodwill	24,500,000		24,500,000
Customer relationships [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	173,000,000		$ 173,000,000		$ 142,600,000
Weighted-average amortization period (in years)			15 years
Customer relationship contractual term, minimum (in years)			3 years
Customer relationship contractual term, maximum (in years)			5 years
Customer relationships [Member] | BTC [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	1,200,000		$ 1,200,000
Customer relationships [Member] | Car-O-Liner Holding AB [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	27,200,000		27,200,000
Customer relationships [Member] | Norbar [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total	$ 1,000,000		1,000,000
BTC [Member] | Trademarks [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total			2,000,000
Norbar [Member] | Trademarks [Member]
Acquired Finite And Indefinite Lived Intangible Assets [Line Items]
Gross carrying value, Total			$ 16,300,000