XML 49 R40.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Revenue and Related Matters - Disaggregation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 1,331,868 | $ 1,156,282 | $ 3,971,129 | $ 3,427,639
Research |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 1,147,823 | 1,037,124 | 3,426,532 | 3,020,094
Conferences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 77,031 | 24,415 | 200,910 | 107,396
Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 107,014 | 94,743 | 343,687 | 300,149
United States and Canada |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 883,227 | 742,403 | 2,612,950 | 2,197,186
United States and Canada | Research |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 771,534 | 671,517 | 2,264,733 | 1,949,282
United States and Canada | Conferences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 44,499 | 14,171 | 139,418 | 74,098
United States and Canada | Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 67,194 | 56,715 | 208,799 | 173,806
Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 289,771 | 276,955 | 897,082 | 826,914
Europe, Middle East and Africa | Research |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 245,093 | 242,273 | 763,639 | 709,230
Europe, Middle East and Africa | Conferences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,034 | 7,975 | 40,308 | 25,156
Europe, Middle East and Africa | Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 26,644 | 26,707 | 93,135 | 92,528
Other International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 158,870 | 136,924 | 461,097 | 403,539
Other International | Research |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 131,196 | 123,334 | 398,160 | 361,582
Other International | Conferences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,498 | 2,269 | 21,184 | 8,142
Other International | Consulting |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | $ 13,176 | $ 11,321 | $ 41,753 | $ 33,815

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_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI https://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
Name: | us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=it_ResearchSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=it_ConferencesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=it_ConsultingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=it_UnitedStatesAndCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=it_EuropeMiddleEastAfricaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=it_OtherInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |