Annual report pursuant to Section 13 and 15(d)

Fair Value of Mastheads Calculated by Discounted Cash Flow Method (Detail)

v2.4.0.6
Fair Value of Mastheads Calculated by Discounted Cash Flow Method (Detail) (Mastheads)
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Goodwill And Intangible Assets [Line Items]        
Discount rate 8.50% 8.50% 8.50% 8.50%
Royalty growth rate 3.00% 3.00% 3.00% 3.00%
Minimum
       
Schedule Of Goodwill And Intangible Assets [Line Items]        
Projected revenue growth ranges 1.50% 1.50% 1.50% 2.00%
Maximum
       
Schedule Of Goodwill And Intangible Assets [Line Items]        
Projected revenue growth ranges 2.50% 3.00% 2.50% 2.50%