XML 107 R92.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Summary of Fair Value of Plan Assets by Asset Category (Parenthetical) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Cash |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 13.00% |
UNITED KINGDOM | Bonds | Balanced Fund |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 24.00% | 32.00%
UNITED KINGDOM | Bonds | Growth Funds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 12.00% | 8.00%
UNITED KINGDOM | Equity Securities | Balanced Fund |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 52.00% | 54.00%
UNITED KINGDOM | Equity Securities | Growth Funds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 67.00% | 67.00%
UNITED KINGDOM | Other Asset | Balanced Fund |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 9.00% | 5.00%
UNITED KINGDOM | Other Asset | Growth Funds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 9.00% | 15.00%
UNITED KINGDOM | Cash | Balanced Fund |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 15.00% | 9.00%
UNITED KINGDOM | Cash | Growth Funds |  |
Defined Benefit Plans And Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit plan, target plan asset allocations | 12.00% | 10.00%

X
- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SummaryOfInvestmentsOtherThanInvestmentsInRelatedPartiesByTypeAxis=us-gaap_BondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gsig_TypeOfFundsAxis=gsig_BalancedFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | gsig_TypeOfFundsAxis=gsig_GrowthFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=gsig_OtherAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |