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Purchases of Common Stock on Monthly Basis (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Nov. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Oct. 30, 2014
Jan. 31, 2014
Equity, Class of Treasury Stock [Line Items]                
Total Number of Shares Purchased 1,500us-gaap_TreasuryStockSharesAcquired 650us-gaap_TreasuryStockSharesAcquired 850us-gaap_TreasuryStockSharesAcquired 5,200us-gaap_TreasuryStockSharesAcquired 3,100us-gaap_TreasuryStockSharesAcquired 3,200us-gaap_TreasuryStockSharesAcquired    
Average Price Paid per Share $ 33.08us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 33.35us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 32.88us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 31.79us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 31.48us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 23.31us-gaap_TreasuryStockAcquiredAverageCostPerShare    
Total Number of Cumulative Shares Purchased as Part of Publicly Announced Plans or Programs   21,193tss_StockRepurchaseProgramCumulativeNumberOfSharesRepurchased 20,543tss_StockRepurchaseProgramCumulativeNumberOfSharesRepurchased 21,193tss_StockRepurchaseProgramCumulativeNumberOfSharesRepurchased     19,693tss_StockRepurchaseProgramCumulativeNumberOfSharesRepurchased  
Maximum Number of Shares That May Yet Be Purchased Under the Plans or Programs   6,807us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased 7,457us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased 6,807us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased     8,307us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased 12,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased