Business Segment Information - Summary of Net Sales by Geographic Destination (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 121,494	$ 113,499	$ 115,850	$ 109,112	$ 121,078	$ 111,708	$ 111,547	$ 108,709	$ 459,955	$ 453,042	$ 433,823
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									361,939	355,353	345,145
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									19,560	19,331	17,059
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									12,688	11,606	7,063
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									10,090	8,731	8,725
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									7,685	7,120	10,356
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 47,993	$ 50,901	$ 45,475