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Stockholders' Equity - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 09, 2015
Jul. 25, 2011
Stockholders Equity [Line Items]                  
Common stock, value of shares authorized to repurchase                 $ 200,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Stock repurchase, shares         727,912us-gaap_StockRepurchasedDuringPeriodShares 107,000us-gaap_StockRepurchasedDuringPeriodShares      
Value of shares repurchased         20,809,000us-gaap_StockRepurchasedDuringPeriodValue 2,875,000us-gaap_StockRepurchasedDuringPeriodValue 11,501,000us-gaap_StockRepurchasedDuringPeriodValue    
Average price of repurchased shares         $ 28.59us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 26.87us-gaap_TreasuryStockAcquiredAverageCostPerShare      
Cash dividend paid $ 0.165us-gaap_CommonStockDividendsPerShareDeclared $ 0.165us-gaap_CommonStockDividendsPerShareDeclared $ 0.165us-gaap_CommonStockDividendsPerShareDeclared $ 0.160us-gaap_CommonStockDividendsPerShareDeclared          
Dividend payment to common shareholders         $ 34,851,000us-gaap_PaymentsOfDividendsCommonStock $ 33,975,000us-gaap_PaymentsOfDividendsCommonStock $ 32,686,000us-gaap_PaymentsOfDividendsCommonStock    
Dividend declared date         Feb. 09, 2015        
Dividend to be paid date         Mar. 13, 2015        
Dividend declared, shareholders of record date         Mar. 02, 2015        
Subsequent Event [Member]                  
Stockholders Equity [Line Items]                  
Cash dividend to be paid               $ 0.165mksi_CashDividendsPaidPerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember