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Net Sales and Long-Lived Assets by Major Geographic Locations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 592,619 $ 587,670 $ 586,010
Long-lived assets 45,729 51,872  
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 472,962 462,234 436,049
Long-lived assets 43,431 49,369  
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 74,991 81,347 93,432
Long-lived assets 1,186 1,550  
Rest of World      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 44,666 44,089 $ 56,529
Long-lived assets $ 1,112 $ 953