Summary of Financial Information for Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total net sales	$ 350,562	$ 345,591	$ 329,002	$ 317,377	$ 308,502	$ 296,692	$ 303,052	$ 267,024	$ 1,342,532	$ 1,175,270	$ 1,081,121
Total segment profit									371,545	279,554	249,865
Total assets	1,976,172				1,699,532				1,976,172	1,699,532	1,646,697
Total depreciation and amortization									102,231	99,886	101,654
Total capital expenditures									93,597	65,260	71,977
SCEM
Segment Reporting Information [Line Items]
Total net sales									485,470	428,328	418,878
Total segment profit									132,859	96,060	100,370
Total assets	749,379				766,126				749,379	766,126	801,250
Total depreciation and amortization									65,559	64,062	65,352
Total capital expenditures									41,216	27,348	29,333
MC
Segment Reporting Information [Line Items]
Total net sales									436,225	362,658	315,817
Total segment profit									160,715	110,042	83,076
Total assets	251,216				200,399				251,216	200,399	183,518
Total depreciation and amortization									12,881	9,222	8,733
Total capital expenditures									24,909	6,281	11,408
AMH
Segment Reporting Information [Line Items]
Total net sales									420,837	384,284	346,426
Total segment profit									77,971	73,452	66,419
Total assets	278,079				267,085				278,079	267,085	259,377
Total depreciation and amortization									20,167	22,874	23,604
Total capital expenditures									16,078	19,029	23,617
Corporate
Segment Reporting Information [Line Items]
Total assets	$ 697,498				$ 465,922				697,498	465,922	402,552
Total depreciation and amortization									3,624	3,728	3,965
Total capital expenditures									$ 11,394	$ 12,602	$ 7,619