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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 0 Months Ended
--- | --- | ---
Dec. 31, 2014 | Jan. 01, 2015
Income Tax Disclosure [Abstract] |  |
Unrecognized income tax benefit, if recognized, would benefit effective tax rate | 0.9 us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate |
Unrecognized income tax benefit related accrued interest and penalties | 0.03 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |
Subsequent Event |  |
Income Tax Disclosure [Abstract] |  |
Net operating loss carryforward |  | 6.1 us-gaap_OperatingLossCarryforwards / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
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 | Subsequent Event |  |
Income Tax Disclosure [Abstract] |  |
Annual limitation of federal NOLs |  | 1.0 sgu_AnnualLimitationOfFutureNetOperatingLossCarryforward / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Expiration date of net operating loss carryforward |  | Dec. 31, 2018
Maximum | Subsequent Event |  |
Income Tax Disclosure [Abstract] |  |
Annual limitation of federal NOLs |  | $ 2.2 sgu_AnnualLimitationOfFutureNetOperatingLossCarryforward / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Expiration date of net operating loss carryforward |  | Dec. 31, 2024

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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