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Revenue Earned in Excess of Billings and Deferred Revenue (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Revenue Earned in Excess of Billings [Line Items]    
Revenue earned in excess of billings $ 27,493us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms $ 22,275us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Time-And-Materials Projects    
Revenue Earned in Excess of Billings [Line Items]    
Revenue earned in excess of billings 16,408us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
/ synt_RevenueEarnedInExcessOfBillingsByTypeAxis
= synt_TimeAndMaterialsProjectsMember		 12,708us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
/ synt_RevenueEarnedInExcessOfBillingsByTypeAxis
= synt_TimeAndMaterialsProjectsMember
Fixed-Price Projects    
Revenue Earned in Excess of Billings [Line Items]    
Revenue earned in excess of billings $ 11,085us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
/ synt_RevenueEarnedInExcessOfBillingsByTypeAxis
= synt_FixedPriceProjectsMember		 $ 9,567us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
/ synt_RevenueEarnedInExcessOfBillingsByTypeAxis
= synt_FixedPriceProjectsMember