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Noncontrolling interest (Tables)
 6 Months Ended
Jun. 30, 2018
Noncontrolling Interest [Abstract]  
Summary of Activity of Noncontrolling Interest-Redeemable
Balance as of December 31, 2017
$
13,393

Net income attributable to noncontrolling interest-redeemable
4,855

Noncontrolling interest-redeemable distributions
(4,644
)
Acquired noncontrolling interest-redeemable
3,428

Balance as of June 30, 2018
$
17,032