Retirement Plans - Weighted Average Assumptions Used in Determining Net Periodic Pension Expense (Detail) (Pension Plans, Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Discount rate	3.85%	3.98%	5.28%
Rate of compensation increase
Expected long-term rate of return on plan assets	7.50%	7.50%	8.00%
Measurement date	2013-12-31	2012-12-31	2011-12-31