Fixed Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 18,464,000	$ 17,681,000
Impairment charges	400,000	0
Leasehold Improvements and Other Fixed Assets [Member]
Property, Plant and Equipment [Line Items]
Asset retirement obligations	9,900,000
Occupancy and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	5,000,000	4,600,000
Software development costs capitalized	6,300,000	10,800,000
Amortization of software development costs	$ 6,200,000	$ 5,900,000