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Employer Contributions, Participant Contributions and Benefit Payments (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Pension Plans
     
Defined Contribution Benefit Plans [Line Items]      
Employer Contributions $ 3,700,000 $ 9,387,000 $ 8,813,000
Benefit Payments 3,764,000 4,456,000 3,438,000
Other Postretirement Benefit Plans, Defined Benefit
     
Defined Contribution Benefit Plans [Line Items]      
Employer Contributions 3,280,000 2,190,000  
Participant Contributions 36,000 18,000 13,000
Benefit Payments 1,942,000 2,083,000 1,644,000
Supplemental Employee Retirement Plans, Defined Benefit
     
Defined Contribution Benefit Plans [Line Items]      
Employer Contributions 53,000 53,000 53,000
Benefit Payments $ 53,000 $ 53,000 $ 53,000