Income Taxes - Components of Expense (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal (including foreign):
Current	$ 28,297	$ 31,401	$ 49,307
Deferred	(6,697)	711	1,675
State:
Current	9,134	9,656	9,244
Deferred	(1,419)	308	(712)
Income tax expense - net	$ 29,315	$ 42,076	$ 59,514