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Commitments, Contingencies And Guarantees (Narrative) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2014 USD ($) Sign Permit | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Rent expense | $ | $ 1,170.0 | $ 1,160.0 | $ 1,140.0
Digital modernization permits issued to Company | 82 |  |
Digital displays operating | 77 |  |
Conversion from static to digital | Sign | 83 |  |
Performance Requirements [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Estimated Maximum Contingency | $ | $ 30.0 |  |

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