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Summary of Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Interest rate swap liabilities | [1] | $ (18,988) | $ (5,093)
Level 3 |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |
Interest rate swap liabilities | [1] | $ (18,988) | $ (5,093)
[1] | See further discussion of interest rate swaps at Note 6

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