Retirement Plans and Other Post-Retirement Benefits - Schedule of Target Allocation for Plan Assets (Detail)	12 Months Ended
	Dec. 31, 2013
Large Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	39.00%
Small and Mid Cap [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	13.00%
International Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	13.00%
Real Estate Investment Trusts (REIT) [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	5.00%
Fixed Income, Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target allocation for the plan assets	30.00%