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Schedule of Listing of Currently Applicable Restrictive and Financial Covenants (Detail)
 12 Months Ended
Dec. 31, 2020
Senior Credit Facility [Member]  
Disclosure of long term debt [Line Items]  
Consolidated senior debt to consolidated covenant EBITDA(1) 0.23%
Consolidated covenant EBITDA to consolidated interest expense 2.68%
Senior Credit Facility [Member] | Top of Range [Member]  
Disclosure of long term debt [Line Items]  
Consolidated senior debt to consolidated covenant EBITDA(1) 2.50%
Senior Credit Facility [Member] | Bottom Of Range [Member]  
Disclosure of long term debt [Line Items]  
Consolidated covenant EBITDA to consolidated interest expense 1.75%
Real Estate Credit Facility [Member]  
Disclosure of long term debt [Line Items]  
Consolidated covenant EBITDA to consolidated interest expense 2.68%
Real Estate Credit Facility [Member] | Bottom Of Range [Member]  
Disclosure of long term debt [Line Items]  
Consolidated covenant EBITDA to consolidated interest expense 1.75%
Unsecured Senior Notes [Member]  
Disclosure of long term debt [Line Items]  
Consolidated interest coverage ratio 2.57%
Unsecured Senior Notes [Member] | Bottom Of Range [Member]  
Disclosure of long term debt [Line Items]  
Consolidated interest coverage ratio 2.00%