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Goodwill - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 60 Months Ended
Dec. 31, 2012
Dec. 31, 2008
Dec. 31, 2012
Goodwill [Line Items]      
Goodwill impairment charges $ 16,739 $ 169,300 $ 186,000
Archeo
     
Goodwill [Line Items]      
Goodwill allocation between segments 19,249    
Goodwill impairment charges 16,739    
Call Driven
     
Goodwill [Line Items]      
Goodwill allocation between segments $ 63,305