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Noncontrolling Interests - Summary of Redeemable Noncontrolling Interests (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Noncontrolling Interest [Abstract]  
Beginning Balance $ 28,806
Acquisition of redeemable noncontrolling interests 3,085
Net income attributable to noncontrolling interests 40
Ending Balance $ 31,931