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Segment And Geographic Information - Total Revenues Summarized by Geographic Area (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenue $ 95,240 $ 100,331 $ 125,552
United States [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenue 78,597 90,475 111,067
United Kingdom & Other [Member]
     
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total Revenue $ 16,643 $ 9,856 $ 14,485