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Fair Value Measurements - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
DerivativeInstrument
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
DerivativeInstrument
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Number of derivative instruments | DerivativeInstrument 0   0    
Fair Value, Inputs, Level 2 [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Debt obligations, fair value   $ 1,600,000   $ 1,600,000 $ 1,600,000
Interest Rate Cap [Member]          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Derivative gain (loss) $ 0 $ (200) $ 0 $ (7)