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Commitments And Contingent Liabilities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Restructuring Cost and Reserve [Line Items]      
Operating lease agreements, expiring year 2020    
Rent expenses $ 6,570us-gaap_LeaseAndRentalExpense $ 6,224us-gaap_LeaseAndRentalExpense $ 5,408us-gaap_LeaseAndRentalExpense