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Pension Plans - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Compensation And Retirement Disclosure [Abstract]      
Pretax curtailment gain $ 0 $ 6,275,000  
Pension liability   6,300,000  
Estimated net loss for the PLP-USA pension plan 12,000    
Prior service cost 0    
Expected long-term return on plan assets 8.00% 8.00% 8.00%
Contribution to pension plan 700,000    
Expense for contribution plan 5,600,000 5,700,000 4,800,000
Weighted average of one year treasury bill 1.00%    
Interest rate for the supplemental profit sharing plan 1.15% 1.12%  
Expense for the supplemental profit sharing plan 300,000 400,000 300,000
Supplemental profit sharing plan unfunded status $ 3,000,000 $ 2,600,000