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Summary of Significant Accounting Policies - Goodwill and Indefinite-lived Intangibles Impairment (Details 9) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Impairment of Long-Lived Assets and Long-lived Assets to be Disposed of      
Goodwill, loss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss $ 0us-gaap_GoodwillImpairmentLoss
Indefinite-lived intangibles impairment recorded $ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill $ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill