Revenue Recognition - Schedule of Disaggregation of Revenue by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Net sales	$ 108,605	$ 143,732
Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	109,875	145,281
Intercompany Sales Elimination
Disaggregation Of Revenue [Line Items]
Net sales	(1,270)	(1,549)
Outdoor Sports | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	1,771	1,859
Fabrication | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	69,793	91,153
Performance structures | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	16,639	19,807
Tube | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	14,954	20,857
Tank | Operating Segments
Disaggregation Of Revenue [Line Items]
Net sales	$ 6,718	$ 11,605