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Investments (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Jul. 18, 2014 | Feb. 18, 2014
Sale of Equity Method Investment [Abstract] |  |  |  |  |  |  |
Other than temporary impairment for equity method investments |  |  |  | $ 11,146 | $ (76) |  |
Australian Radio Network [Member] |  |  |  |  |  |  |
Sale of Equity Method Investment [Abstract] |  |  |  |  |  |  |
Percentage of ownership |  |  |  | 50.00% |  |  |
Equity Method Ownership Percentage Disposal |  |  |  |  |  |  | 50.00%
Other than temporary impairment for equity method investments |  |  | $ 95,400 |  |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal |  | $ (2,400) |  |  |  |  |
Australian Radio Network [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |
Sale of Equity Method Investment [Abstract] |  |  |  |  |  |  |
Foreign exchange losses |  | $ 11,500 |  |  |  |  |
Buspak [Member] |  |  |  |  |  |  |
Sale of Equity Method Investment [Abstract] |  |  |  |  |  |  |
Percentage of ownership |  |  |  | 50.00% |  |  |
Equity Method Ownership Percentage Disposal |  |  |  |  |  | 50.00% |
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 4,500 |  |  |  |  |  |

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- Definition Represents gains or losses resulting from transactions conducted in foreign currencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6939497&loc=d3e30226-110892 + Details
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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=35687916&loc=d3e32787-111569 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
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