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Other assets - Schedule of Other Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Income tax recoverable $ 1,961 $ 5,967
Deferred financing costs 4,449 3,546
Restricted cash 18,954 15,939
Other 9,335 10,811
Total other assets 34,699 36,263
Less: current portion (6,115) (7,110)
Other assets, noncurrent $ 28,584 $ 29,153