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Business and Significant Accounting Policies (Detail) - Intangible Assets Subject to Amortization (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite-lived Intangible Assets [Roll Forward]    
Gross cost $ 21,808us-gaap_FiniteLivedIntangibleAssetsGross $ 22,152us-gaap_FiniteLivedIntangibleAssetsGross
Additions due to acquisition 31,975us-gaap_FinitelivedIntangibleAssetsAcquired1 [1]  
Non-competition agreement (2) 1,500it_FiniteLivedIntangibleAssetsNoncompeteAmortization [2]  
Foreign currency translation impact (1,025)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments (344)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
Gross cost 54,258us-gaap_FiniteLivedIntangibleAssetsGross 21,808us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated amortization (23,569)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization [3],[4] (15,701)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization [3],[4]
Finite-lived intangible assets, net 30,689us-gaap_FiniteLivedIntangibleAssetsNet 6,107us-gaap_FiniteLivedIntangibleAssetsNet
Trade Names    
Finite-lived Intangible Assets [Roll Forward]    
Gross cost 6,023us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 6,019us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Additions due to acquisition 915us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [1]  
Non-competition agreement (2) 0it_FiniteLivedIntangibleAssetsNoncompeteAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [2]  
Foreign currency translation impact (14)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 4us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Gross cost 6,924us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 6,023us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Accumulated amortization (6,202)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [3],[4] (4,817)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 [3],[4]
Finite-lived intangible assets, net 722us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember		 1,206us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TradeNamesMember
Customer Relationships    
Finite-lived Intangible Assets [Roll Forward]    
Gross cost 10,146us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 10,562us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Additions due to acquisition 18,054us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [1]  
Non-competition agreement (2) 0it_FiniteLivedIntangibleAssetsNoncompeteAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [2]  
Foreign currency translation impact (267)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 (416)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Gross cost 27,933us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 10,146us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated amortization (11,072)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [3],[4] (8,372)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 [3],[4]
Finite-lived intangible assets, net 16,861us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 1,774us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Content    
Finite-lived Intangible Assets [Roll Forward]    
Gross cost   3,447us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= it_ContentMember
Foreign currency translation impact   49us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= it_ContentMember
Gross cost   3,496us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= it_ContentMember
Accumulated amortization   (1,388)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= it_ContentMember		 [3],[4]
Finite-lived intangible assets, net   2,108us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= it_ContentMember
Media Content    
Finite-lived Intangible Assets [Roll Forward]    
Gross cost 3,496us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		  
Additions due to acquisition 206us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		 [1]  
Non-competition agreement (2) 0it_FiniteLivedIntangibleAssetsNoncompeteAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		 [2]  
Foreign currency translation impact (142)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		  
Gross cost 3,560us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		  
Accumulated amortization (2,246)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		 [3],[4]  
Finite-lived intangible assets, net 1,314us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_MediaContentMember		  
Software    
Finite-lived Intangible Assets [Roll Forward]    
Gross cost 2,143us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 2,124us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Additions due to acquisition 5,000us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 [1]  
Non-competition agreement (2) 0it_FiniteLivedIntangibleAssetsNoncompeteAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 [2]  
Foreign currency translation impact (574)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 19us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Gross cost 6,569us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 2,143us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Accumulated amortization (2,603)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 [3],[4] (1,124)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 [3],[4]
Finite-lived intangible assets, net 3,966us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember		 1,019us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Noncompete Agreements    
Finite-lived Intangible Assets [Roll Forward]    
Gross cost 0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		  
Additions due to acquisition 7,800us-gaap_FinitelivedIntangibleAssetsAcquired1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		 [1]  
Non-competition agreement (2) 1,500it_FiniteLivedIntangibleAssetsNoncompeteAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		 [2]  
Foreign currency translation impact (28)us-gaap_FiniteLivedIntangibleAssetsTranslationAdjustments
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		  
Gross cost 9,272us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		  
Accumulated amortization (1,446)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		 [3],[4]  
Finite-lived intangible assets, net $ 7,826us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember		  
[1] The additions are due to the Company's 2014 Acquisitions. See Note 2 — Acquisitions for additional information.
[2] The non-competition intangible relates to a separation agreement with the Company's former CFO.
[3] Aggregate amortization expense related to intangible assets was $8.2 million, $5.4 million, and $4.4 million in 2014, 2013, and 2012, respectively.
[4] Intangible assets are amortized against earnings over the following periods: Trade name—2 to 5 years; Customer relationships 4 to 7 years; Content—1.5 to 4 years; Software—3 years; Non-compete—4 to 5 years.