XML 145 R125.htm IDEA: XBRL DOCUMENT v3.10.0.1
Commitments, Contingencies and Legal Proceedings - Additional Information (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Operable_Unit
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
USD ($)
Commitments Contingencies And Litigation [Line Items]          
Annual payments due under operating leases   $ 13,800      
Aggregate contractual obligation   $ 109,500      
Number of operable units | Operable_Unit   5      
Term of agreement wih third party for monitoring and maintenance in OU1-OU4a   30 years      
Difference recorded in escrow account   $ 2,000      
Assumption of escrow   4,746      
Total amount available in escrow account   8,900      
Reserve for Environmental liabilities, current portion   23,000     $ 28,500
Other Long-Term Liabilities [Member]          
Commitments Contingencies And Litigation [Line Items]          
Reserve for Environmental liabilities, remaining portion   $ 22,000      
Minimum [Member]          
Commitments Contingencies And Litigation [Line Items]          
Period over which cash expenditure to be incurred for monitoring activities   30 years      
Glatfelter Consent Decree [Member] | Subsequent Event [Member]          
Commitments Contingencies And Litigation [Line Items]          
Payments for governments unreimbursed past costs $ 20,500        
Georgia Pacific [Member]          
Commitments Contingencies And Litigation [Line Items]          
Settlement payable amount   $ 9,500      
Payment due date   2017-08      
OU2-5 [Member]          
Commitments Contingencies And Litigation [Line Items]          
Estimated future cost of cleanup work     $ 13,400 $ 13,400  
Expected cleanup work continuation year   through 2019