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Accounts Payable, Accrued Expenses and Other Liabilities - Components of Other Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Liabilities Noncurrent [Abstract]      
ROU liabilities $ 220,867    
Payroll taxes payable 50,605 $ 31,055  
Accrued compensation 35,534 35,103  
Business acquisition, contingent cash consideration 27,195 28,099  
Credit enhancement deposit 25,000 25,000  
Financial guarantee liability 73 32 $ 54
Deferred rent   49,334  
Other liabilities $ 359,274 $ 168,623