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Debt - Debt and Financing Leases (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 21, 2020
May 15, 2020
Dec. 31, 2019
Debt Instrument [Line Items]        
Line of credit, current $ 15,614     $ 12,296
Long-term debt and finance leases, excluding line of credit, current 24,377     10,265
Long-term debt and finance leases, current 39,991     22,561
Long-term debt and finance leases, non-current 315,270     310,378
Less: Unamortized debt issuance costs 1,005     1,230
Long-term debt and finance leases $ 314,265     $ 309,148
Weighted Average Interest Rate 3.92%     4.70%
Additional Credit Capacity at December 31, 2020 $ 668,180      
Less, amounts used to secure letters of credit and other unavailable funds 59,696      
Remaining available credit capacity 608,484      
Promissory Note        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 11,000     $ 0
Weighted Average Interest Rate 1.653%      
Term loan A        
Debt Instrument [Line Items]        
Long-term debt and finance leases, excluding line of credit, current $ 12,500     10,000
Long-term debt and finance leases, non-current $ 175,000     $ 187,500
Weighted Average Interest Rate 3.22%     3.30%
Unsecured notes        
Debt Instrument [Line Items]        
Long-term debt and finance leases, non-current $ 116,880     $ 116,880
Weighted Average Interest Rate 7.625%     7.625%
Equipment financing        
Debt Instrument [Line Items]        
Long-term debt and finance leases, excluding line of credit, current $ 6,037      
Long-term debt and finance leases, non-current $ 22,058 $ 396 $ 31,142  
Weighted Average Interest Rate 3.049%   3.05%  
Equipment financing        
Debt Instrument [Line Items]        
Long-term debt and finance leases, excluding line of credit, current $ 5,840     $ 265
Long-term debt and finance leases, non-current $ 1,332     $ 5,998
Weighted Average Interest Rate 1.509%     2.613%
Revolving Credit Facility        
Debt Instrument [Line Items]        
Additional Credit Capacity at December 31, 2020 $ 500,000      
Accounts receivable securitization facility        
Debt Instrument [Line Items]        
Additional Credit Capacity at December 31, 2020 100,000      
Asian Credit Lines        
Debt Instrument [Line Items]        
Line of credit, current $ 4,614     $ 12,296
Weighted Average Interest Rate 3.915%     4.701%
Additional Credit Capacity at December 31, 2020 $ 68,180