Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Tax Cuts and Jobs Act of 2017, Income Tax Expense (Benefit)		$ 35,000,000
Unlimited range of net operating loss carryforwards	5 years
Cash payments for income taxes, including interest	$ 28,900,000	41,800,000	$ 74,100,000
Proceeds from income tax refunds	9,800,000
Liability for unrecognized tax benefits	9,568,000	13,585,000	10,725,000
Unrecognized tax benefits highly certain	1,900,000	5,000,000
Unrecognized tax benefits that would impact effective tax rate	7,700,000	6,400,000
Accrued interest	600,000	0
Penalties accrued	0	0	0
Penalties expense	0	$ 0	$ 0
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 29,100,000