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Related party transactions (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Transactions with Third Party [Line Items]    
Contributions from redeemable non-controlling interests $ 0 $ 31,105
Equity Method Investee    
Transactions with Third Party [Line Items]    
Reimbursement of expenses 11,390 $ 4,675
Related Party    
Transactions with Third Party [Line Items]    
Contributions from redeemable non-controlling interests $ 305,000