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Related Party Transactions - Balances of Transactions (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Related Party Transactions [Abstract]    
Cash and restricted cash deposits in affiliated bank $ 52,953 $ 23,227
Other due/to from affiliate    
Accounts receivable 23,902 18,073
Prepaid expenses and other assets 2,211 1,216
Other long-term assets 199 288
Accounts payable 5,831 5,827
Unearned income $ 24,252 $ 19,768