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Employee Benefits - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Jun. 30, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Postretirement Benefit Plan [Member]
Dec. 31, 2012
U.S. Pension Plans [Member]
Dec. 31, 2011
U.S. Pension Plans [Member]
Dec. 31, 2011
U.S. Pension Plans [Member]
Equity Securities [Member]
Dec. 31, 2011
U.S. Pension Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Dec. 31, 2011
Non-U.S. Pension Plans [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Other Investment Companies [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Real Estate [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Equity Securities [Member]
Dec. 31, 2012
Non-U.S. Pension Plans [Member]
Fixed Income Securities [Member]
Dec. 31, 2012
Qualified U.S. Pension Plans [Member]
Dec. 31, 2012
Qualified non-U.S. pension plans [Member]
Dec. 31, 2012
Non-Qualified U.S. Pension Plan [Member]
Dec. 31, 2012
Deferred Compensation Plan [Member]
Dec. 31, 2011
Deferred Compensation Plan [Member]
Dec. 31, 2012
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]                                        
Percentage of matching contribution if compensation percentage below low range   100.00%                                    
Percentage of matching contribution if compensation percentage between high range and low range   75.00%                                    
Matching participant's contribution, percentage on compensation                                       4.00%
Matching participant's contribution, percentage on compensation, range low   4.00%                                    
Matching participant's contribution, percentage on compensation, range high   8.00%                                    
Percentage of employees eligible to accrue benefits under the defined plan   50.00%                                    
Matching participant's contribution, average percentage on compensation   6.00%                                    
Retirement liabilities   $ 337,927,000 $ 315,633,000   $ 164,562,000 $ 147,541,000     $ 36,700,000 $ 34,752,000               $ 27,000,000 $ 27,000,000  
Capital in excess of par value related to Deferred Compensation Plan   12,300,000 12,000,000                                  
Total cash surrender value of life insurance contracts   51,391,000 56,177,000                                  
Settlement charge and a special termination benefit charge 3,900,000                                      
Curtailment charge 400,000                                      
Target percentage of investment in equity securities             50.00% 50.00%                        
Target percentage of investment in alternative investments, minimum             60.00% 35.00%     5.00% 5.00% 20.00% 55.00%            
Target percentage of investment in alternative investments, maximum             65.00% 40.00%     10.00% 10.00% 25.00% 60.00%            
1% increase in accumulated postretirement benefit obligation   7,300,000                                    
1% increase in postretirement expense   400,000                                    
1% decrease in accumulated postretirement benefit obligation   6,900,000                                    
1% decrease in postretirement expense   400,000                                    
Contribution to the plans         18,415,000 23,235,000     16,767,000 18,817,000         18,400,000 16,800,000        
Benefit payments                                 3,400,000      
Contribution to other postretirement plans       $ 6,500,000