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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
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12 Months Ended |
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Contingencies And Commitments [Line Items] |
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| Lease commitment with media research and rating providers, aggregate amount |
$ 19.2 |
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| Non-cancelable operating lease expiration term |
2017-02 |
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| Total rent expense under operating leases |
9.8 |
10.2 |
10.1 |
| Bonus paid to executives |
0.2 |
0.5 |
0 |
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Facilities and Broadcast Equipment [Member]
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| Contingencies And Commitments [Line Items] |
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| Non-cancelable operating lease expiration term |
2050-11 |
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Santa Monica [Member]
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| Contingencies And Commitments [Line Items] |
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| Area under operating leases for corporate headquarters |
16,000 |
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| Lease Expiration Year |
2021 |
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Los Angeles [Member]
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| Contingencies And Commitments [Line Items] |
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| Area under operating leases for corporate headquarters |
45,000 |
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| Lease Expiration Year |
2016 |
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Minimum [Member]
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| Contingencies And Commitments [Line Items] |
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| Lease commitment with media research and rating providers, annual commitment range |
0.2 |
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Maximum [Member]
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| Contingencies And Commitments [Line Items] |
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| Lease commitment with media research and rating providers, annual commitment range |
$ 12.4 |
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