Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Unrecognized tax benefits, interest expense	$ 0		$ 0	$ 0	$ 900,000
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	4.50%		4.90%	0.60%	4.80%
Income tax provision (benefit)	$ 1,026,000		$ (29,606,000)	$ (128,000)	$ (29,220,000)
Trademark impairment	$ 4,386,000		$ 521,653,000	$ 77,721,000	521,653,000
Pretax loss					613,000,000
Discrete item related to change in estimate certain state and local income tax audits					$ 2,000,000
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Minimum change in ownership percentage				50.00%
Measurement of change in ownership period				3 years
Minimum change in ownership percentage held by shareholders directly or indirectly				5.00%