Employee Benefit Plans - Asset Allocations for Funded Pension Plans (Detail)							12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Equity Securities [Member]	Dec. 31, 2012 Equity Securities [Member]	Dec. 31, 2013 Debt Securities [Member]	Dec. 31, 2012 Debt Securities [Member]	Dec. 31, 2013 Target Asset Allocation 2014 [Member]	Dec. 31, 2013 Target Asset Allocation 2014 [Member] Equity Securities [Member]	Dec. 31, 2013 Target Asset Allocation 2014 [Member] Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets, Total							100.00%	71.00%	29.00%
Asset allocation, Total	100.00%	100.00%	76.00%	68.00%	24.00%	32.00%