Pension and Employee Benefit Plans - Details of Defined Benefit Pension Plan Asset Allocation by Asset Category (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	100.00%
Percentage of Plan Asset	100.00%	100.00%
Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	70.00%
Percentage of Plan Asset		69.00%
Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	30.00%
Percentage of Plan Asset		31.00%
Minimum [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Asset	64.00%
Minimum [Member] | Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Asset	27.00%
Maximum [Member] | Equity securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Asset	73.00%
Maximum [Member] | Debt securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Asset	36.00%