XML 57 R45.htm IDEA: XBRL DOCUMENT v3.20.2
Other Financial Statement Information - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 01, 2018
Nov. 02, 2016
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Inventory [Line Items]              
Cost of inventories for certain materials using LIFO method     $ 30,800,000   $ 30,800,000   $ 32,000,000.0
Expense (benefit) charge to earnings from LIFO inventory changes       $ 0 $ 200,000 $ 3,000,000  
Name of plaintiff         Altalink, L.P.    
Complaint filling date         November 2016    
Estimated damages from defendants $ 29,400,000 $ 56,000,000.0          
Maximum [Member]              
Inventory [Line Items]              
Expense (benefit) charge to earnings from LIFO inventory changes     $ 100,000