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Summary of Significant Accounting Policies (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Oct. 02, 2012 | Dec. 31, 2012 Markets Networks | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 Markets Networks | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2013 Subsequent Event [Member] | Dec. 31, 2012 Common Class [Member] | Mar. 31, 2013 Common Class [Member] Subsequent Event [Member] | Dec. 31, 2012 Favorable Lease Agreements [Member] Maximum [Member] | Dec. 31, 2012 Favorable Lease Agreements [Member] Minimum [Member] | Dec. 31, 2012 Other Intangible Assets [Member] Maximum [Member] | Dec. 31, 2012 Other Intangible Assets [Member] Minimum [Member]
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock options outstanding having antidilutive effect |  |  |  |  |  |  |  |  |  | 93,000 | 304,000 | 392,000 |  |  |  |  |  |  |
Four-for-three stock split |  |  |  |  |  |  |  |  |  | The stock split increased the Company's issued and outstanding shares of common stock from approximately 3,659,753 shares of Class A Common Stock and 597,504 shares of Class B Common Stock to approximately 4,877,323 and 796,672 shares, respectively. |  |  |  |  |  |  |  |  |
Concentration Risk, Market Risk |  |  |  |  |  |  |  |  |  | 44.00% | 44.00% | 45.00% |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  | $ 6,805,000 | $ 7,053,000 | $ 7,285,000 |  |  |  |  |  |  |
Interest expense related to the amortization of debt issuance costs |  |  |  |  |  |  |  |  |  | 231,000 | 642,000 | 1,079,000 |  |  |  |  |  |  |
Write-off debt issuance costs |  | 0 | 0 | 0 | 0 | 0 | 0 | 1,326,000 | 0 | 0 | 1,326,000 | 0 |  |  |  |  |  |  |
Net book value of deferred costs |  | 793,000 |  |  |  | 1,024,000 |  |  |  | 793,000 | 1,024,000 |  |  |  |  |  |  |  |
Share repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |
Treasury Stock, Shares Acquired |  |  |  |  |  |  |  |  |  | 2,924,000 | 5,380,000 | 7,288,000 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  | $ 27.30 | $ 21.71 | $ 10.69 |  |  |  |  |  |  |
Advertising and promotion costs |  |  |  |  |  |  |  |  |  | 3,182,000 | 3,675,000 | 3,562,000 |  |  |  |  |  |  |
Stock repurchase program, remaining authorization amount |  |  |  |  |  |  |  |  |  |  |  |  |  | 14,200,000 | 30,000,000 |  |  |  |
Special cash dividend declared on Classes A and B Common Stock | $ 1.24 |  |  |  |  |  |  |  |  | $ 1.24 | $ 0 | $ 0 |  |  |  |  |  |  |
Dividend paid | $ 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized over the lives of the leases term range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 years | 4 years | 11 years | 1 year
Number of shares authorized to be repurchased |  | 60,000,000 |  |  |  |  |  |  |  | 60,000,000 |  |  | 75,800,000 |  |  |  |  |  |
Number of broadcast licenses |  | 97 |  |  |  |  |  |  |  | 97 |  |  |  |  |  |  |  |  |
Number of market serving |  | 25 |  |  |  |  |  |  |  | 25 |  |  |  |  |  |  |  |  |

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