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Component of Net Sales by Region (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Net sales $ 28,492us-gaap_SalesRevenueNet $ 24,855us-gaap_SalesRevenueNet
UNITED STATES    
Segment Reporting Information [Line Items]    
Net sales 23,265us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US		 19,005us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_US
CANADA    
Segment Reporting Information [Line Items]    
Net sales $ 5,227us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 $ 5,850us-gaap_SalesRevenueNet
/ us-gaap_StatementGeographicalAxis
= country_CA