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Purchase Price Allocation (Detail) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Sep. 27, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Goodwill		$ 313,626	$ 148,285	$ 148,367	$ 149,718
Acquisition, net of cash acquired		$ 323,487	$ 0
Supreme Industries Inc. [Member]
Cash	$ 36,878
Accounts receivable	25,155
Inventories	34,258
Prepaid expense and other	10,070
Current assets	106,361
Property, plant, and equipment	62,293
Intangibles	158,000
Goodwill	165,400
Other assets	127
Total assets	492,181
Current portion of long term debt	7,167
Accounts payable	10,546
Other accrued liabilites	44,787
Current liabilities	62,500
Deferred income taxes	66,399
Long term liabilities	2,917
Total liabilities	131,816
Acquisition	360,365
Acquisition, net of cash acquired	$ 323,487