Segment information - Summary of Financial Information for Reportable Segments (Detail) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 26, 2020 USD ($)	Jun. 27, 2020 USD ($)	Mar. 28, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information
Number of Reportable Segments									3
Total net sales	$ 517,594	$ 480,987	$ 448,405	$ 412,327	$ 426,998	$ 394,147	$ 378,874	$ 391,047	$ 1,859,313	$ 1,591,066	$ 1,550,497
Total segment profit									487,907	367,898	386,259
Total assets	2,917,696				2,516,086				2,917,696	2,516,086	2,317,641
Total depreciation and amortization									136,522	141,403	127,268
Total capital expenditures									131,752	112,355	110,153
SCEM
Segment Reporting Information
Total net sales									609,532	526,519	530,241
Total segment profit									127,969	98,327	127,080
Total assets	1,022,357				936,609				1,022,357	936,609	757,381
Total depreciation and amortization									71,417	75,391	70,329
Total capital expenditures									54,989	57,585	44,337
MC
Segment Reporting Information
Total net sales									742,186	633,664	553,838
Total segment profit									248,910	194,398	166,852
Total assets	819,602				786,131				819,602	786,131	680,080
Total depreciation and amortization									39,775	41,917	33,590
Total capital expenditures									40,656	28,549	38,331
AMH
Segment Reporting Information
Total net sales									538,682	458,290	493,404
Total segment profit									111,028	75,173	92,327
Total assets	437,322				372,849				437,322	372,849	359,991
Total depreciation and amortization									25,231	23,911	22,805
Total capital expenditures									36,107	25,212	26,545
Corporate
Segment Reporting Information
Total assets	$ 638,415				$ 420,497				638,415	420,497	520,189
Total depreciation and amortization									99	184	544
Total capital expenditures									0	1,009	940
Inter-segment elimination
Segment Reporting Information
Total net sales									$ (31,087)	$ (27,407)	$ (26,986)