cm:Level2TextBlock: us-gaap:RevenueRecognitionAdvertisingBarterTransactions
| Revenue Recognition, Advertising Barter Transactions [Policy Text Block] |
| us-gaap:RevenueRecognitionAdvertisingBarterTransactions |
| Describes an entity's accounting policy for revenue recognition for advertising barter transactions. An advertising barter transaction is a nonmonetary exchange of advertising. The disclosure may include information regarding the volume and type of advertising surrendered and received (such as the number of equivalent pages, the number of minutes, or the overall percentage of advertising volume). |
| cm:Level2TextBlock |
| Text Block (HTML) (nonnum:textBlockItemType) |
| For Period (duration) |
| (no balance type) |
| false |
| us-gaap:RevenueRecognitionAdvertisingBarterTransactions |