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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended 0 Months Ended
Mar. 31, 2015
Jan. 01, 2015
Income Tax Disclosure [Abstract]    
Net operating loss carryforward   $ 6.1us-gaap_OperatingLossCarryforwards
Unrecognized income tax benefit, if recognized, would benefit effective tax rate 1.0us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Unrecognized income tax benefit related accrued interest and penalties 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued  
Federal    
Income Tax Disclosure [Abstract]    
Number of years for examination Four  
New York    
Income Tax Disclosure [Abstract]    
Number of years for examination Four  
Connecticut    
Income Tax Disclosure [Abstract]    
Number of years for examination Four  
Pennsylvania    
Income Tax Disclosure [Abstract]    
Number of years for examination Four  
New Jersey    
Income Tax Disclosure [Abstract]    
Number of years for examination Five  
Minimum    
Income Tax Disclosure [Abstract]    
Annual limitation of federal NOLs   1.0sgu_AnnualLimitationOfFutureNetOperatingLossCarryforward
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Expiration date of net operating loss carryforward   Dec. 31, 2018
Maximum    
Income Tax Disclosure [Abstract]    
Annual limitation of federal NOLs   $ 2.2sgu_AnnualLimitationOfFutureNetOperatingLossCarryforward
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
Expiration date of net operating loss carryforward   Dec. 31, 2024