Fixed Assets, Net - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Property, Plant and Equipment [Line Items]
Depreciation expense			$ 43,047,000	$ 41,078,000
Impairment charges	$ 0	$ 200,000	100,000	700,000
Leasehold Improvements and Other Fixed Assets [Member]
Property, Plant and Equipment [Line Items]
Asset retirement obligations	7,300,000		7,300,000
Occupancy and Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	8,100,000	7,600,000	15,200,000	15,400,000
Software development costs capitalized	8,700,000	9,600,000	19,900,000	14,300,000
Amortization of software development costs	$ 5,100,000	$ 5,100,000	$ 11,500,000	$ 10,600,000