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Income Taxes - Income from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ 79,669 $ 74,151 $ 66,848
Foreign (Canada) 171 169 158
Income (loss) from continuing operations before income tax expense (benefit) $ 79,840 $ 74,320 $ 67,006