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Operating Segment and Enterprise Wide Reporting - Schedule of Net Long-lived Tangible Assets by Location (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net long-lived tangible assets $ 39,868 $ 46,300
United States [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net long-lived tangible assets 35,167 42,098
United Kingdom [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net long-lived tangible assets 2,212 2,626
Europe (Excluding United Kingdom) [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net long-lived tangible assets 174 313
Other [Member]
    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net long-lived tangible assets $ 2,315 $ 1,263