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Operating Segment and Enterprise Wide Reporting - Summary of Reportable Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Revenue $ 77,521 $ 69,815 $ 78,953 $ 71,361 $ 75,161 $ 68,773 $ 78,932 $ 70,165 $ 297,650 $ 293,031 $ 283,335
Direct margin                 192,645 191,555 186,610
Selling, marketing, administrative and other expenses                 (166,677) (156,929) (146,957)
Amortization of intangible assets                 (2,230) (2,445) (2,562)
Reorganization costs                 (1,905) (1,421) (375)
Other income and gains/losses on investments                 (1,841) 1,394 231
Income before income taxes                 19,992 32,154 36,947
BT [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 156,068 154,974 147,688
Direct margin                 104,810 105,816 102,713
M&S [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 128,738 125,228 122,474
Direct margin                 83,689 81,798 78,132
Events [Member]
                      
Segment Reporting Information [Line Items]                      
Revenue                 12,844 12,829 13,173
Direct margin                 $ 4,146 $ 3,941 $ 5,765