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Revenues - Outstanding Contract Asset and (Liability) Accounts (Detail) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]        
Contract assets $ 73,853 $ 67,804 $ 68,971 $ 73,039
Change in contract assets – increase (decrease) 4,882 (5,235)    
Contract liabilities 333,409 199,967 $ 215,093 $ 167,306
Change in contract liabilities – increase (118,316) (32,661)    
Net change $ (113,434) $ (37,896)