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Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other assets |  |
Assets: |  |
Available-for-sale securities | $ 332 | $ 281
Other Current Assets |  |
Assets: |  |
Derivative financial instruments | 250 | 241
Accrued expenses and other current liabilities |  |
Liabilities: |  |
Derivative financial instruments | 957 | 39
Fair Value Measurements, Level 1 | Other assets |  |
Assets: |  |
Available-for-sale securities | 332 | 281
Fair Value Measurements, Level 2 | Other Current Assets |  |
Assets: |  |
Derivative financial instruments | 250 | 241
Fair Value Measurements, Level 2 | Accrued expenses and other current liabilities |  |
Liabilities: |  |
Derivative financial instruments | $ 957 | $ 39

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