Commitments and Contingent Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 StorageSpaces Land_Parcel ATM ParkingSpaces Buildings
Commitments And Contingencies Disclosure [Abstract]
Parcels of land | Land_Parcel	2
Number of ATM locations | ATM	20
Number of storage facilities | StorageSpaces	2
Number of parking lots | ParkingSpaces	4
Number of buildings | Buildings	13
Lease expiry period maximum	2064