Property and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 97,744	$ 120,403
Less-accumulated depreciation and amortization	(76,248)	(96,225)
Property and equipment, net	21,496	24,178
Purchased and capitalized software costs
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 36,894	55,940
Purchased and capitalized software costs \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	2 years
Purchased and capitalized software costs \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	7 years
Furniture, fixtures and equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 28,749	30,917
Furniture, fixtures and equipment \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	2 years
Furniture, fixtures and equipment \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	10 years
Computer equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,265	16,657
Computer equipment \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	2 years
Computer equipment \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	6 years
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 14,939	15,513
Leasehold improvements \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	2 years
Leasehold improvements \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, depreciable life	10 years
In-process assets
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,897	$ 1,376

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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