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Net Sales and Long-Lived Assets by Major Geographic Locations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 579,476 $ 592,619 $ 587,670
Long-lived assets 48,793 45,729  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 460,788 472,962 462,234
Long-lived assets 45,285 43,431  
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 74,834 74,991 81,347
Long-lived assets 2,779 1,186  
Rest of World      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 43,854 44,666 $ 44,089
Long-lived assets $ 729 $ 1,112