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Summary of Company's Operating Results for Discontinued Operations (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income before income taxes from discontinued operations $ 0 $ 45
Income tax provision 0 17
Income from discontinued operations, net of tax $ 0 $ 28