Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, interest expense	$ 0		$ 0	$ 0	$ 600,000
Income tax provision (benefit), federal rate				21.00%		35.00%
Estimated income tax benefit		$ 67,000,000
Net income tax provision		34,000,000
Income tax benefit valuation allowance		$ 101,000,000
Effective income tax rate from continuing operations	3.60%		35.60%	2.50%	(16.30%)
Income tax provision (benefit)	$ (2,804,000)		$ (5,501,000)	$ (1,154,000)	$ 386,000
Impairment charges of trademark and goodwill	$ 111,100,000
Pretax loss					2,400,000
Discrete item related to change in estimate certain state and local income tax audits					$ 2,000,000