Legal Expenses Exposures and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013 Customer
Loss Contingencies [Line Items]
Limitation of liability, amount of retained holdback	$ 0.3
Number of customers	1

Limitation of liability, amount of retained holdback

No definition available.

Name:	synt_LimitationOfLiabilityAmountOfRetainedHoldback
Namespace Prefix:	synt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration