XML 70 R81.htm IDEA: XBRL DOCUMENT v3.20.1
Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract]      
Balance at the beginning of the year $ 98,211 $ 111,909 $ 116,658
Additions charged (credited) to expense, net (579) 2,735 3,376
Payments, net (3,124) (16,433) (8,125)
Balance at the end of the year 94,508 98,211 111,909
Amounts recognized in the balance sheet:      
Current liability 3,065 5,027 5,302
Noncurrent liability $ 91,443 $ 93,184 $ 106,607