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Noncontrolling Interests - Summary of Redeemable Noncontrolling Interests (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Noncontrolling Interest [Abstract]  
Beginning Balance $ 28,806
Acquisition of redeemable noncontrolling interests 3,300
Net income attributable to noncontrolling interests 258
Ending Balance $ 32,364