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Changes to Carrying Amount of Goodwill by Reporting Unit (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Goodwill [Line Items]  
Addition due to acquisition $ 7,455 [1]
Ideas International Limited
 
Goodwill [Line Items]  
Addition due to acquisition $ 7,455
[1] The Company acquired Ideas International in the second quarter of 2012 and recorded $7.5 million of goodwill. All of the recorded goodwill resulting from the acquisition has been included in the Research segment. See Note 2-Acquisition above for additional information.