Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Components Of Income Tax Expense Benefit [Line Items]
Income tax effective rate	50.90%		8.80%	28.40%	56.30%
Income taxes	$ 13,656		$ (117)	$ 8,869	$ 6,352
Internal Revenue Service [Member]
Components Of Income Tax Expense Benefit [Line Items]
Income taxes		$ (1,800)
Minimum [Member]
Components Of Income Tax Expense Benefit [Line Items]
Decrease in unrecognized tax benefits	13,000			13,000
Maximum [Member]
Components Of Income Tax Expense Benefit [Line Items]
Decrease in unrecognized tax benefits	$ 13,400			$ 13,400