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Fair Value - Additional Information (Details)
₨ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2016
INR (₨)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
INR (₨)
Dec. 31, 2015
USD ($)
Fair Value Disclosures [Abstract]            
Transfers of financial instruments between levels       $ 0   $ 0
Transfers of financial instruments between level 2 to level 1       0   0
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Notional value of foreign currency forward     ₨ 735.0 10,700,000 ₨ 850.0 $ 13,000,000
Level 3 | Minimum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Receivables exposure, undiscounted       0    
Level 3 | Maximum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Receivables exposure, undiscounted       $ 8,500,000    
Receivable from sold investment            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Unrealized gain during the period $ 303,000 $ 861,000        
Receivable from sold investment | Investment income and other, net            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Unrealized gain during the period $ 300,000 $ 900,000