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Contingencies - Additional Information (Detail)
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
States
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Site Contingency [Line Items]        
Environmental and legal losses, minimum   $ 20,700,000    
Environmental and legal losses, maximum   41,100,000    
Accrued liability for losses   20,700,000   $ 22,000,000
Cash outlays related to legal and environmental matters   $ 1,900,000 $ 500,000  
Number of states examining company unclaimed property records | States   7    
Liability for unpaid claim and claim adjustment expense, claims paid $ 4,016,000 $ 784,000   $ 3,475,000
VAT inflation, penalty and interest charges   $ 0    
Maywood Site [Member]        
Site Contingency [Line Items]        
Accrual for environmental loss contingencies, increase (decrease) for revision in estimates $ 600,000      
Wilmington Site [Member]        
Site Contingency [Line Items]        
Contribution for future response costs   5.00%    
Payment of environmental response costs   $ 2,300,000