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Impairment Charges and Reserves - Impairment Charges on Assets or Investments (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Impairment Charges And Impairment Of Joint Venture Investments [Abstract]        
Assets marketed for sale $ 0 $ 0 $ 600 $ 0
Assets included in the spin-off of RVI 0 18,100 0 48,500
Reserve (adjustment) of preferred equity interest 4,634 (1,625) 5,733 2,336
Total impairment charges $ 4,600 $ 16,500 $ 6,300 $ 50,800