Employee Benefit Plans - Pension Plan Asset Allocations (Detail)	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	74.00%	76.00%
Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	6.00%	4.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	20.00%	20.00%