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Income Taxes - Income from Continuing Operations Before Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]                      
United States                 $ 57,665 $ 50,385 $ 41,809
Foreign (Canada)                 167 183 147
Income (loss) from continuing operations before income tax expense (benefit) $ (3,000) $ 16,376 $ 11,381 $ 33,075 $ (3,515) $ 11,673 $ 11,270 $ 31,140 $ 57,832 $ 50,568 $ 41,956