Business Segment Information - Summary of Net Sales by Geographic Destination (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 116,896	$ 105,247	$ 108,942	$ 102,738	$ 108,537	$ 98,497	$ 104,075	$ 98,679	$ 433,823	$ 409,788	$ 396,489
Domestic Tax Authority [Member] | U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									345,145	316,873	305,505
Foreign Tax Authority [Member] | Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									17,059	16,664	15,655
Foreign Tax Authority [Member] | United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									8,725	10,362	11,376
Foreign Tax Authority [Member] | Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									10,356	11,334	13,512
Foreign Tax Authority [Member] | Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 52,538	$ 54,555	$ 50,441