XML 32 R31.htm IDEA: XBRL DOCUMENT v2.4.0.6
Schedule Of Quantitative Information For Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Feb. 28, 2011
Fair Value, Option, Quantitative Disclosures [Line Items]          
Contingent consideration $ 16,935 $ 21,595 $ 1,100 $ 10,900 $ 9,600
Contingent consideration, Weighted Average, Growth Rate 6.00% 8.00%      
Contingent consideration, Weighted Average, Discount Rate 5.00% 8.00%      
Minimum [Member]
         
Fair Value, Option, Quantitative Disclosures [Line Items]          
Contingent consideration, Growth Rate 1.00% 4.00%      
Contingent consideration, Discount Rate 1.00% 1.00%      
Maximum [Member]
         
Fair Value, Option, Quantitative Disclosures [Line Items]          
Contingent consideration, Growth Rate 20.00% 12.00%      
Contingent consideration, Discount Rate 15.00% 15.00%