Employee Benefit Plans - Weighted Average Assumptions to Measure Benefit Obligation (Detail)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Pension Plans [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Discount rate 4.80% 3.60%
Expected long-term return on plan assets 7.00% 7.20%
Post-Retirement Benefit Plans [Member]
   
Pension Plans, Postretirement and Other Employee Benefits [Line Items]    
Discount rate 5.30% 3.80%