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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND REDEEMABLE NONCONTROLLING INTEREST (UNAUDITED) (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Stockholders Equity [Abstract]        
Cash distributions, declared per share $ 0.11639 $ 0.10581 $ 0.23278 $ 0.21162