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Purchase Price Allocation (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Purchase Price Allocation (Detail) - USD ($) $ in Thousands	Sep. 27, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill		$ 317,464	$ 148,367	$ 149,718
Acquisition, net of cash acquired		$ 323,487	$ 0	$ 0
Supreme Industries Inc. [Member]
Cash	$ 36,878
Accounts receivable	25,146
Inventories	34,084
Prepaid expense and other	21,730
Property, plant, and equipment	59,891
Intangibles	161,200
Goodwill	169,235
Other assets	127
Total assets	508,291
Current portion of long term debt	7,167
Accounts payable	10,546
Other accrued liabilites	55,350
Deferred income taxes	71,946
Long term liabilities	2,917
Total liabilities	147,926
Acquisition	360,365
Acquisition, net of cash acquired	$ 323,487