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Segment Information and Concentrations of Risk - Schedule of Geographic Concentration of the Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total $ 150,396 $ 161,531
Operating Segments [Member] | United States [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total 146,441 157,661
Operating Segments [Member] | Canada [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total 2,634 2,836
Operating Segments [Member] | Europe, Latin America and Asia [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Assets by Geographic Concentration, Total $ 1,321 $ 1,034