Organization - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Amount due from affiliate by subsidiary	$ 100		$ 100
Franchise fees imposed by local governmental authorities	$ 5,800,000	$ 5,400,000	$ 17,600,000	$ 17,200,000