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Line of Credit and Term Loan - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Sep. 12, 2016
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 07, 2018
Dec. 31, 2017
Jul. 18, 2017
Line of Credit Facility [Line Items]                
Gains/ (losses) recognized in other comprehensive income (loss)   $ 975,000 $ (672,000) $ 3,885,000 $ 291,000      
Interest Rate Risk                
Line of Credit Facility [Line Items]                
Hedged interest rate risk on entire term loan   $ 300,000,000   $ 300,000,000        
Derivative, Fixed Interest Rate   3.16%   3.16%        
Interest Rate Swap | Term Loan Facility                
Line of Credit Facility [Line Items]                
Gains/ (losses) recognized in other comprehensive income (loss)   $ 1,000,000 $ (700,000) $ 3,900,000 $ 300,000      
Senior Credit Facility                
Line of Credit Facility [Line Items]                
Line of credit, interest rate description       The interest rates applicable to the Senior Credit Facility other than in respect of swing line loans are LIBOR plus 1.50% or, at the option of the Company, the Base Rate (to be defined as the highest of (x) the Federal Funds Rate [as that term is defined in the Senior Credit Facility plus 0.50%, (y) the Bank of America prime rate, or (z) LIBOR plus 1.00%) plus 0.50%. Each swingline loan shall bear interest at the Base Rate plus 0.50%. In no event shall LIBOR be less than 0% per annum.        
Debt principal payments   $ 5,600,000            
Senior Credit Facility | LIBOR | Option One                
Line of Credit Facility [Line Items]                
Line of credit, interest rate 1.50%              
Senior Credit Facility | LIBOR | Option Two                
Line of Credit Facility [Line Items]                
Line of credit, interest rate 1.00%              
Senior Credit Facility | Base Rate | Option Two                
Line of Credit Facility [Line Items]                
Line of credit, interest rate 0.50%              
Senior Credit Facility | Federal Funds Effective Swap Rate | Option Two                
Line of Credit Facility [Line Items]                
Line of credit, interest rate 0.50%              
Senior Credit Facility | Term Loan Facility                
Line of Credit Facility [Line Items]                
Line of credit, effective interest rate   3.5935%   3.5935%        
Swing Line Loan | Base Rate                
Line of Credit Facility [Line Items]                
Line of credit, interest rate 0.50%              
Swing Line Loan | Maximum | LIBOR                
Line of Credit Facility [Line Items]                
Line of credit, interest rate 0.00%              
Amended Credit Agreement                
Line of Credit Facility [Line Items]                
Unamortized debt issuance cost   $ 700,000   $ 700,000     $ 700,000  
Amended Credit Agreement | Term Loan Facility                
Line of Credit Facility [Line Items]                
Debt outstanding balance   268,100,000   268,100,000     278,900,000  
Amended Credit Agreement | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Debt outstanding balance   $ 0   $ 0     $ 79,800,000  
Bank of America | Senior Credit Facility                
Line of Credit Facility [Line Items]                
Debt maximum borrowing capacity $ 500,000,000              
Bank of America | Senior Credit Facility | Maximum                
Line of Credit Facility [Line Items]                
Aggregate amount of Additional restricted payments               $ 50,000,000
Bank of America | Senior Credit Facility | Guarantors | Syntel India | Security and Pledge Agreement                
Line of Credit Facility [Line Items]                
Pledge in equity interests in Syntel Private Limited, India 65.00%              
Bank of America | Senior Credit Facility | Term Loan Facility                
Line of Credit Facility [Line Items]                
Debt maximum borrowing capacity $ 300,000,000              
Debt maturity period 5 years              
Maturity date of debt instrument Sep. 11, 2021              
Bank of America | Senior Credit Facility | Revolving Credit Facility                
Line of Credit Facility [Line Items]                
Debt maximum borrowing capacity $ 200,000,000         $ 25,000,000    
Debt maturity period 5 years              
Maturity date of debt instrument Sep. 11, 2021