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Acquisitions, Goodwill, and Other Intangible Assets (Narrative) (Details) (USD $)
12 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Countries
Dec. 31, 2011
Dec. 31, 2010
Mar. 31, 2010
Aegis Equities Research [Member]
Years
Apr. 02, 2010
Aegis Equities Research [Member]
Apr. 02, 2010
Aegis Equities Research [Member]
Deductions for Income Tax Purposes [Member]
Apr. 12, 2010
Old Broad Street Research Ltd. [Member]
May 03, 2010
Realpoint, LLC [Member]
Jul. 02, 2010
Morningstar Denmark [Member]
Nov. 30, 2010
Annuity Intelligence Business of Advanced Sales and Marketing Corporation [Member]
Years
Nov. 02, 2010
Annuity Intelligence Business of Advanced Sales and Marketing Corporation [Member]
Jul. 02, 2010
Footnoted business of Financial Fineprint Inc. and Seeds Group [Member]
Dec. 31, 2011
Aspect Huntley [Member]
Jul. 02, 2010
75% [Member]
Morningstar Denmark [Member]
Jul. 02, 2010
25% [Member]
Morningstar Denmark [Member]
Business Acquisition [Line Items]                              
Cash paid to acquire the entity         $ 10,269,000   $ 17,937,000 $ 38,327,000       $ 6,113,000   $ 15,467,000 $ 4,725,000
Intangible assets           1,787,000                  
Intangible assets         5,801,000   9,266,000 19,120,000 9,854,000   6,300,000 2,661,000      
Business acquisition, purchase price                     14,113,000        
Number of shares of restricted stock issued to acquire the entity               199,174              
Amortization period for tax purposes assigned to goodwill and intangible assets, in years       3           15          
Equity method investment, ownership percentage                 75.00%            
Ownership percentage                 100.00%            
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net         10,320,000   22,569,000 43,816,000 20,192,000   14,113,000 7,555,000      
Goodwill impairment loss 0 0                          
Deferred tax liability             2,317,000   2,504,000     800,000      
Number of countries in which entity operates, approximately 27                            
Holding gain upon acquisition of additional ownership of equity 0 0 4,564,000           4,564,000            
Goodwill         5,117,000   12,422,000 24,903,000 12,342,000   9,028,000 3,869,000      
Total deferred tax liabilities (43,193,000) (37,385,000)                          
Noncontrolling interest 1,378,000 1,646,000                          
Impairment loss                         $ 800,000