Schedule of Expected Return on Assets for Net Periodic Pension Cost (Detail)	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]
Total	71.00%	64.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Total	19.00%	25.00%
Pooled Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Total	5.00%	6.00%
Insurance Contracts
Defined Benefit Plan Disclosure [Line Items]
Total	3.00%	3.00%
Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Total	2.00%	2.00%