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v3.10.0.1

Fair Value Information - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Fair value assets transfers from Level 1 to Level 2 | $ 0 | $ 0
Fair value assets transfers from Level 2 to Level 1 | 0 | 0
Fair value liabilities transfers from Level 1 to Level 2 | 0 | 0
Fair value liabilities transfers from Level 2 to Level 1 | $ 0 | $ 0
Minimum [Member] |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Term of interest rate swap contracts by the counterparty, years | 3 years |
Maximum [Member] |  |
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items] |  |
Term of interest rate swap contracts by the counterparty, years | 30 years |

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