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Long-term debt - Derivative Instruments (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Designated as Hedging Instrument | Interest rate cap agreements | Other long-term assets |  |
Derivative [Line Items] |  |
Derivative assets, Fair value | $ 2,135 | $ 1,032

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- Details
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- Details
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