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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Community
Dec. 31, 2013
Community
Income Tax Contingency [Line Items]    
Deferred tax assets related to federal Net operating loss carry forwards $ 9.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic  
Deferred tax assets related to state Net operating loss carry forwards 2.5us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal  
Texas communities consolidated 36csu_TexasCommunitiesConsolidated 36csu_TexasCommunitiesConsolidated
Domestic Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Net operating loss carry forwards 28.8us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
Alternative minimum tax credit carryforward 0.3us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
Operating loss carryforward additional 8.4csu_OperatingLossCarryforwardsRelatedToShareBasedPaymentAwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
State and Local Jurisdiction [Member]    
Income Tax Contingency [Line Items]    
Net operating loss carry forwards $ 53.1us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
Minimum [Member]    
Income Tax Contingency [Line Items]    
Federal NOL expiration period period 2033  
State NOL expiration period 2015  
Maximum [Member]    
Income Tax Contingency [Line Items]    
Federal NOL expiration period period 2034  
State NOL expiration period 2034