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Amounts Recognized in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net loss | $ 852 | $ 848 | $ 460 |
Transition obligation | 1 | 1 | 1 |
Total recognized in accumulated other comprehensive income | $ 853 | $ 849 | $ 461 | $ 258

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