Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Deferred tax liabilities noncurrent	$ 11,466,000		$ 4,566,000	$ 11,466,000
Foreign tax credit carry forwards			$ 5,300,000
Foreign tax credit carryforwards, expiration start year			2023
Foreign tax credit carryforwards, expiration end year			2024
Income tax provision (benefit), federal rate			21.00%	35.00%
Estimated income tax benefit	67,000,000
Net income tax provision	34,000,000		$ (5,562,000)	$ 34,205,000
Income tax benefit valuation allowance	101,000,000
Effective income tax rate from continuing operations			(7.90%)	14.70%
Indefinitely reinvested foreign earnings			$ 0
Unrecognized tax benefit	354,000	$ 7,470,000	0	$ 354,000
Unrecognized tax benefit that would affect the effective tax rate if recognized			0
Unrecognized tax benefit reduction due to settlements with taxing authorities and or statute of limitations expirations			0
Unrecognized tax benefit, interest accrued	900,000		0	900,000
Unrecognized tax benefit, penalties accrued	$ 0		$ 0	0
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%
Internal Revenue Service (IRS) | Minimum
Income Taxes [Line Items]
Income tax, years under examination		2014
New York City Audit
Income Taxes [Line Items]
Income tax examination resulted tax charge			$ 0	$ 2,000,000
New York City Audit | Earliest Tax Year
Income Taxes [Line Items]
Income tax, years under examination			2011	2007
New York City Audit | Latest Tax Year
Income Taxes [Line Items]
Income tax, years under examination			2014	2014
New York City Audit | Tax Years 2011 Through 2014
Income Taxes [Line Items]
Income tax examination resulted tax charge			$ 500,000
The State of California Audit | Earliest Tax Year
Income Taxes [Line Items]
Income tax, years under examination			2013
The State of California Audit | Latest Tax Year
Income Taxes [Line Items]
Income tax, years under examination			2014
Federal
Income Taxes [Line Items]
Operating loss carry forwards			$ 75,500,000
Operating loss carry forwards, expiration year			2037
State and Local Jurisdiction
Income Taxes [Line Items]
Operating loss carry forwards			$ 32,000,000
Operating loss carry forwards, expiration start year			2034
Operating loss carry forwards, expiration end year			2035
Local Jurisdictions
Income Taxes [Line Items]
Operating loss carry forwards			$ 0