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Fair Value Measurements (Details) (Recurring, USD $)
Dec. 31, 2014
Mar. 31, 2015
Fair value
    
Assets measured at fair value    
Assets: $ 220,502,961us-gaap_HeldToMaturitySecuritiesFairValue
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Fair value | United States Treasury Securities
    
Assets measured at fair value    
Assets:   220,504,066us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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/ us-gaap_FairValueByMeasurementFrequencyAxis
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Quoted Prices in Active Markets (Level 1)
    
Assets measured at fair value    
Assets: 220,502,961us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember		  
Quoted Prices in Active Markets (Level 1) | United States Treasury Securities
    
Assets measured at fair value    
Assets:   $ 220,504,066us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsRecurringMember
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember