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Commitments and contingent liabilities - future minimum lease payments under noncancelable operating leases (Detail)
$ in Thousands
Dec. 31, 2015
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2016 $ 30,191
2017 26,299
2018 19,087
2019 15,746
2020 15,274
2021 and thereafter $ 13,510