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Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) (Consolidated Gross Revenues [Member])
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12 Months Ended | ||
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Consolidated Gross Revenues [Member]
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| Concentration Risk, Customer | 0 | 0 | 0 |
| Concentration Risk, Percentage | 10.00% | ||
| X | ||||||||||
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- Definition
Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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