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Fair Value Measurements (Details) (Recurring, United States Treasury Securities, USD $)
Dec. 31, 2014
Fair value
  
Assets measured at fair value  
Assets: $ 220,502,961us-gaap_HeldToMaturitySecuritiesFairValue
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Quoted Prices in Active Markets (Level 1)
  
Assets measured at fair value  
Assets: $ 220,502,961us-gaap_HeldToMaturitySecuritiesFairValue
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