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Noncontrolling Interests - Components of Shareholders' Equity Attributable to Noncontrolling Interests (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Noncontrolling Interest [Line Items]    
Shareholders’ equity attributable to noncontrolling interests $ 386,686 $ 440,779
Group A Units    
Noncontrolling Interest [Line Items]    
Shareholders’ equity attributable to noncontrolling interests 381,028 434,943
Other    
Noncontrolling Interest [Line Items]    
Shareholders’ equity attributable to noncontrolling interests $ 5,658 $ 5,836