XML 23 R43.htm IDEA: XBRL DOCUMENT v2.4.1.9
Stock for Redemptions Based on Number of Years Stock Held (Detail)
 3 Months Ended
Mar. 31, 2015
Less than 1  
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]  
Redemption price 0.00%ck0001585389_PercentageRedemptionPrice
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= ck0001585389_LessThanOneYearMember
1 or more but less than 3  
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]  
Redemption price 90.00%ck0001585389_PercentageRedemptionPrice
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= ck0001585389_OneOrMoreButLessThanThreeYearsMember
3 or more but less than 4  
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]  
Redemption price 95.00%ck0001585389_PercentageRedemptionPrice
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= ck0001585389_ThreeOrMoreButLessThanFourYearsMember
4 or more  
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]  
Redemption price 100.00%ck0001585389_PercentageRedemptionPrice
/ us-gaap_ScheduleOfSharesSubjectToMandatoryRedemptionBySettlementTermsAxis
= ck0001585389_FourOrMoreYearsMember