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Commitments and Contingencies - Litigation (Details) (Lawsuit Against Sonitrol Corporation [Member], USD $)
In Millions, unless otherwise specified
 0 Months Ended
Apr. 11, 2014
Jul. 19, 2012
issue
Lawsuit Against Sonitrol Corporation [Member]
    
Gain Contingencies [Line Items]    
Number of issues appealed and upheld by trial court's ruling   2core_LitigationAppealsNumberofCourtRulingsUpheld
/ us-gaap_LitigationCaseAxis
= core_LawsuitAgainstSonitrolCorporationMember
Number of issues being appealed   3core_LitigationNumberofIssuesAppealed
/ us-gaap_LitigationCaseAxis
= core_LawsuitAgainstSonitrolCorporationMember
Amount of settlement awarded $ 2.75us-gaap_LitigationSettlementAmount
/ us-gaap_LitigationCaseAxis
= core_LawsuitAgainstSonitrolCorporationMember