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Noncontrolling interest - Summary of Activity of Noncontrolling Interest-Redeemable (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]  
Noncontrolling interest-redeemable, Beginning balance $ 12,567
Net income attributable to noncontrolling interest-redeemable 2,387
Noncontrolling interest-redeemable distributions (1,977)
Sale of noncontrolling interest-redeemable (84)
Noncontrolling interest-redeemable, Ending balance $ 12,893