Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.10.0.1
Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Liability for unrecognized tax $ 5,900   $ 5,900   $ 5,400
Accrued interest and penalties applied to uncertain tax positions     2,200   $ 2,100
Income tax expense (benefit) $ 1,586 $ 1,743 $ 3,190 $ 4,085