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Operating Segments - Summary of Information about Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Revenue $ 78,164 $ 79,093 $ 149,663 $ 149,353
Direct margin 50,297 51,166 98,383 97,760
Selling, marketing, administrative and other expenses (40,430) (39,068) (82,948) (79,077)
Amortization of intangible assets (554) (586) (1,113) (1,200)
Reorganization costs (314) (51) (1,905) (1,394)
Other income and gains/losses on investments 204 214 529 682
Income before income taxes 9,203 11,675 12,946 16,771
BT [Member]
        
Segment Reporting Information [Line Items]        
Revenue 38,434 39,523 77,309 77,848
Direct margin 25,798 26,851 52,829 53,058
Selling, marketing, administrative and other expenses            
Amortization of intangible assets            
Reorganization costs            
Other income and gains/losses on investments            
Income before income taxes            
M&S [Member]
        
Segment Reporting Information [Line Items]        
Revenue 31,807 31,222 63,589 62,402
Direct margin 20,376 20,054 41,694 40,734
Selling, marketing, administrative and other expenses            
Amortization of intangible assets            
Reorganization costs            
Other income and gains/losses on investments            
Income before income taxes            
Events [Member]
        
Segment Reporting Information [Line Items]        
Revenue 7,923 8,348 8,765 9,103
Direct margin 4,123 4,261 3,860 3,968
Selling, marketing, administrative and other expenses            
Amortization of intangible assets            
Reorganization costs            
Other income and gains/losses on investments            
Income before income taxes