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Aggregate Fair Value of Derivative Financial Instruments (Detail) - Fair Value, Measurements, Recurring - Interest Rate Swap - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Interest rate swap asset | $ 5,104 |
Interest rate swap liability | 1,943 | $ 12,171
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Interest rate swap asset | 0 |
Interest rate swap liability | 0 | 0
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Interest rate swap asset | 5,104 |
Interest rate swap liability | 1,943 | 12,171
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis |  |
Interest rate swap asset | 0 |
Interest rate swap liability | $ 0 | $ 0

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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References No definition available. + Details
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