Employee Benefit Plans (Pension Benefit Plan) - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Discount rates	2.64%	2.20%	3.70%
Rate of compensation increase	2.00%	2.25%	2.25%
Expected long-term rates of return	5.40%	5.40%	5.40%