Employee Benefit Plans - Assumptions Used to Determine Net Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on Assets (as a percent)		7.00%	7.00%
Discount rate (as a percent)		3.58%	4.11%
Post-Employment Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected return on Assets (as a percent)	0.00%	0.00%	0.00%
Discount rate (as a percent)	3.20%	2.99%
Minimum [Member] | Post-Employment Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate (as a percent)		3.39%
Maximum [Member] | Post-Employment Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate (as a percent)		3.95%