Commitments and Contingencies - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 20, 2015 demolition
Loss Contingencies [Line Items]
Insurance recoveries	$ 7,700
Income from other investments, net	5,795	$ 7,310	$ 7,359
Settlement accrual	8,000
Number of historical demolition | demolition				200
Income from Other Investments
Loss Contingencies [Line Items]
Income from other investments, net	$ 1,300