Employee Benefit Plans - Weighted Average Asset Allocation by Asset Category (Detail) - Pension Benefit Plan [Member]	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocations by asset categories (as a percent)	0.00%	100.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocations by asset categories (as a percent)	0.00%	58.00%
Equity Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocations by asset categories (as a percent)	0.00%	26.00%
Debt Securities [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocations by asset categories (as a percent)	0.00%	12.00%
Other [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Asset allocations by asset categories (as a percent)	0.00%	4.00%