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Related Party Transactions - Balances of Transactions (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Related Party Transactions [Abstract]    
Cash and restricted cash deposits in affiliated bank $ 13,376 $ 15,918
Other due/to from affiliate    
Accounts receivable 21,739 21,461
Prepaid expenses and other assets 839 699
Other long-term assets 500 554
Accounts payable 3,977 6,300
Unearned income $ 16,541 $ 14,383