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Indebtedness - Bank Debt - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
CommercialBank
Sep. 30, 2018
Sep. 30, 2019
USD ($)
CommercialBank
Sep. 30, 2018
Oct. 31, 2019
USD ($)
CommercialBank
Mar. 31, 2019
Mar. 27, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                
Bank debt $ 318,919,000   $ 318,919,000         $ 932,018,000
Bank Credit Facility                
Debt Instrument [Line Items]                
Bank Credit facility, maximum amount 4,000,000,000.0   4,000,000,000.0          
Bank Credit facility, borrowing base $ 3,000,000,000.0   $ 3,000,000,000.0       $ 3,000,000,000.0  
Percentage holding of commercial banks, Maximum 5.80%   5.80%          
Number of commercial banks included in current bank group | CommercialBank 27   27          
Maturity date of loan     Apr. 13, 2023          
Bank commitments $ 2,000,000,000.0   $ 2,000,000,000.0       $ 2,000,000,000.0  
Bank debt 328,000,000.0   328,000,000.0          
Undrawn letters of credit 255,200,000   255,200,000          
Borrowing capacity available under the commitment amount $ 1,400,000,000   $ 1,400,000,000          
Weighted average interest rate on the bank credit facility 3.80% 3.90% 4.00% 3.70%        
Annual rate of commitment fee paid on the undrawn balance     0.30%          
Bank Credit Facility | Scenario Forecast                
Debt Instrument [Line Items]                
Number of commercial banks included in current bank group | CommercialBank         27      
Bank commitments         $ 2,400,000,000      
Bank Credit Facility | Alternate Base Rate                
Debt Instrument [Line Items]                
Interest rate margin     0.25%          
Bank Credit Facility | LIBOR Rate                
Debt Instrument [Line Items]                
Interest rate margin     1.25%          
Bank Credit Facility | Minimum                
Debt Instrument [Line Items]                
Annual rate of commitment fee paid on the undrawn balance     0.30%          
Bank Credit Facility | Minimum | Credit Facility                
Debt Instrument [Line Items]                
Annual rate of commitment fee paid on the undrawn balance     0.15%          
Bank Credit Facility | Minimum | Alternate Base Rate                
Debt Instrument [Line Items]                
Base rate on debt 0.25%   0.25%          
Bank Credit Facility | Minimum | Alternate Base Rate | Credit Facility                
Debt Instrument [Line Items]                
Base rate on debt           0.125%    
Bank Credit Facility | Minimum | LIBOR Rate                
Debt Instrument [Line Items]                
Base rate on debt 1.25%   1.25%          
Bank Credit Facility | Minimum | LIBOR Rate | Credit Facility                
Debt Instrument [Line Items]                
Base rate on debt           1.125%    
Bank Credit Facility | Maximum                
Debt Instrument [Line Items]                
Annual rate of commitment fee paid on the undrawn balance     0.375%          
Bank Credit Facility | Maximum | Credit Facility                
Debt Instrument [Line Items]                
Annual rate of commitment fee paid on the undrawn balance     0.30%          
Bank Credit Facility | Maximum | Alternate Base Rate                
Debt Instrument [Line Items]                
Base rate on debt 1.25%   1.25%          
Bank Credit Facility | Maximum | Alternate Base Rate | Credit Facility                
Debt Instrument [Line Items]                
Base rate on debt           0.75%    
Bank Credit Facility | Maximum | LIBOR Rate                
Debt Instrument [Line Items]                
Base rate on debt 2.25%   2.25%          
Bank Credit Facility | Maximum | LIBOR Rate | Credit Facility                
Debt Instrument [Line Items]                
Base rate on debt           1.75%