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Equity - Schedule of Issuances and Repurchases of Shares (Detail)
 1 Months Ended 12 Months Ended
Jul. 31, 2018
shares
Dec. 31, 2019
Category
shares
Dec. 31, 2018
Category
shares
Dec. 31, 2017
shares
Beginning balance   277,179,999 223,156,080  
Issuance   35,655 4,276,916  
Initial public offering     45,818,182  
Vested awards | Category   151,182 5,742,843  
Reclassification   0    
Repurchase and cancellation     (1,814,022) (11,994,444)
Ending balance   277,366,836 277,179,999 223,156,080
Class C common stock [member]        
Beginning balance   0 7,695,072  
Initial public offering     0  
Reclassification   0 (5,881,050)  
Repurchase and cancellation (1,814,022)   (1,814,022)  
Ending balance   0 0 7,695,072
Non voting shares [member] | Class A common stock [member]        
Beginning balance   125,697,438 60,775,470  
Issuance   35,655 4,276,916  
Initial public offering     54,902,209  
Vested awards | Category   151,182 5,742,843  
Reclassification   52,804,309 0  
Repurchase and cancellation     0  
Ending balance   178,688,584 125,697,438 60,775,470
Voting shares [member] | Class B common stock [member]        
Beginning balance   151,482,561 154,685,538  
Initial public offering     (9,084,027)  
Reclassification   (52,804,309) 5,881,050  
Repurchase and cancellation     0  
Ending balance   98,678,252 151,482,561 154,685,538