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Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total $ 93,045 $ 111,465
United States [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total 91,241 108,932
Canada [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total 951 808
Europe, Latin America and Asia [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total $ 853 $ 1,725