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Goodwill and Intangible Assets, net - Additional Information (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]      
Goodwill accumulated impairment losses $ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss   $ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
Amortization expense $ 1,596,000us-gaap_AmortizationOfIntangibleAssets $ 687,000us-gaap_AmortizationOfIntangibleAssets