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Net Income Per Common Share - Additional Information (Detail)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net Income Loss Per Common Share      
Exercise of stock options 0.3ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions 0.4ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions 0.3ter_StockIssuedDuringPeriodSharesSaleOfStockAndExerciseOfStockOptions
Restricted stock units exercise to purchase shares     0.3ter_IssuanceOfOrdinarySharesUponExerciseOfEmployeeStockOptionsAndRestrictedStockUnitsShares