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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect of accounting change $ 2,161,598 $ 2,037,145   $ 2,197,219 $ 2,052,394 $ 2,125,434 $ 1,987,720
Accounts receivable, allowance for credit loss $ 5,347     11,143      
Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect of accounting change       $ 6,074      
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect of accounting change     $ 6,000        
Accounts receivable, allowance for credit loss     $ (8,000)