Employee Benefit Plans - Assumptions Used to Determine Accumulated Benefit Obligations (Detail)	Dec. 31, 2016	Dec. 31, 2015
Pension Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate (as a percent)		3.65%
Post-Employment Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate (as a percent)	3.15%	3.20%