Business Segment Information - Summary of Property, Plant and Equipment of Reporting Segments by Geographic Area (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment net	$ 45,139	$ 48,916
U.S. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment net	34,008	38,398
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment net	7,658	7,013
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment net	382	617
Brazil [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment net	475	769
Others [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property plant and equipment net	$ 2,616	$ 2,119