Schedule of Plan Assets Category (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Total	100.00%	100.00%
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Asset Allocation	23.00%	47.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Asset Allocation	74.00%	49.00%
Other
Defined Benefit Plan Disclosure [Line Items]
Asset Allocation	3.00%	4.00%