Label |
Element |
Value |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
$ 4,242
|
Variable Interest Entity [Member] |
|
|
Cash and cash equivalents |
us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 0
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Variable O Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
4
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
4
|
AOCI Attributable to Parent [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
$ 4,242
|
Additional Paid-in Capital [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
0
|
Common Stock [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
0
|
Noncontrolling Interests [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
0
|
Retained Earnings [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
0
|
Treasury Stock [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
0
|
Redeemable Noncontrolling Interests [Member] |
|
|
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |
us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax |
0
|
CFFs [Member] |
|
|
Cash and cash equivalents |
us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ (11)
|
CFFs [Member] | Variable Interest Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
CFFs [Member] | Variable O Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
2
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
2
|
Offshore Funds [Member] |
|
|
Cash and cash equivalents |
us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 0
|
Offshore Funds [Member] | Variable Interest Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
0
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
0
|
Offshore Funds [Member] | Variable O Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Partnerships [Member] |
|
|
Cash and cash equivalents |
us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 86
|
Partnerships [Member] | Variable Interest Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
0
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
0
|
Partnerships [Member] | Variable O Entity [Member] |
|
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Entities Consolidated at Beginning of Period |
gbl_EntitiesConsolidatedAtBeginningOfPeriod |
1
|
Prior to Consolidation [Member] |
|
|
Cash and cash equivalents |
us-gaap_CashAndCashEquivalentsAtCarryingValue |
$ 298,149
|