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Prepaid Expenses And Other Current Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Prepaid Expenses And Other Current Assets [Abstract]    
Prepaid income taxes $ 2,599 $ 1,984
Survey participant incentives and prepaid postage 2,179 1,770
Insurance recovery receivables 484 993
Other 2,621 2,394
Prepaids and other current assets $ 7,883 $ 7,141