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Current and Deferred Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [Line Items] |  |  |
Current | $ 4,354 | $ 3,624 | $ 4,077
Deferred | 465 | (24,729) | (4,066)
Total | $ 4,819 | $ (21,105) | $ 11

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