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New Accounting Pronouncements - Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported Accompanying Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cash and cash equivalents $ 1,921 $ 424    
Restricted cash 39,535 32,985    
Total cash, cash equivalents and restricted cash 41,456 $ 33,409 $ 36,085 $ 31,374
Accounting Standards Update 2016-18 [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cash and cash equivalents 1,921   1,161  
Restricted cash 39,535   34,924  
Total cash, cash equivalents and restricted cash $ 41,456   $ 36,085