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Debt (Detail) - Borrowings (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Amount outstanding $ 405,000us-gaap_LineOfCredit [1] $ 205,000us-gaap_LineOfCredit [1]
Term loan    
Debt Instrument [Line Items]    
Amount outstanding 400,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= it_BankTermLoanMember
[2] 144,375us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= it_BankTermLoanMember
[2]
Revolver    
Debt Instrument [Line Items]    
Amount outstanding 0us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= it_RevolverMember
[2],[3] 55,625us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= it_RevolverMember
[2],[3]
Other    
Debt Instrument [Line Items]    
Amount outstanding $ 5,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= it_OtherLoanMember
[4] $ 5,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= it_OtherLoanMember
[4]
[1] As of December 31, 2014, $20.0 million of debt was classified as short term and $385.0 million was classified as long term on the Consolidated Balance Sheets.
[2] The contractual annual interest rate as of December 31, 2014 on the term loan was 1.42%, which consisted of a floating Eurodollar base rate of 0.17% plus a margin of 1.25%. However, the Company has an interest rate swap contract which converts the floating Eurodollar base rate to a 2.26% fixed base rate on the first $200.0 million of Company borrowings (see below). As a result, the Company’s weighted-average annual interest rate on the $400.0 million of outstanding debt under the 2014 Credit Facility as of December 31, 2014, including the margin, was approximately 2.46%.
[3] The Company had approximately $1.1 billion of available borrowing capacity on the revolver (not including the expansion feature) as of December 31, 2014.
[4] Consists of a $5.0 million State of Connecticut economic development loan with a 3.0% fixed rate of interest. The loan was originated in 2012 and has a 10 year maturity. Principal payments are deferred for the first five years and the loan may be repaid at any point by the Company without penalty. The loan has a principal forgiveness provision in which up to $2.5 million of the loan may be forgiven if the Company meets certain employment targets during the first five years of the loan.