Quarterly report pursuant to Section 13 or 15(d)

Organization - Summary of Reconciliation of Noncontrolling Interests (Detail)

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Organization - Summary of Reconciliation of Noncontrolling Interests (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Redeemable Noncontrolling Interest Equity Fair Value [Abstract]        
Noncontrolling interest, beginning balance     $ 19,373  
Redemption of units     (203)  
Net income attributable to noncontrolling interest in the Operating Partnership $ 191 $ 171 535 $ 343
Distributions     (650)  
Adjustment to redemption value     1,451  
Noncontrolling interest, ending balance $ 20,506   $ 20,506