Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.8.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Operating Loss Carryforwards [Line Items]          
Provision (benefit) for income taxes for continuing operations $ 9,890 $ 8,248 $ 27,576 $ 23,288  
Effective income tax rate 39.90% 38.60% 39.00% 35.60%  
Valuation allowance $ 1,000   $ 1,000   $ 1,000
Tax Year 2014 [Member]          
Operating Loss Carryforwards [Line Items]          
Provision (benefit) for income taxes for continuing operations     $ 1,800