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Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Commitments And Contingencies Disclosure [Abstract]    
Balance at the beginning of the period $ 48,006  
Additions charged to expense, net 1,228  
Payments, net (745)  
Balance at the end of the period 48,489  
Amounts recognized in the Condensed Consolidated Balance Sheet at the end of the period:    
Current liability 5,115 5,667
Noncurrent liability 43,374 42,339
Total $ 48,489