Intangible Assets, net - Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Cost	$ 354,534	$ 299,416
Accumulated Amortization	(253,885)	(216,849)
Net	100,649	82,567
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Cost	36,500
Accumulated Amortization	(2,548)
Net	33,952	108,000
Software
Finite-Lived Intangible Assets [Line Items]
Cost	45,820	35,527
Accumulated Amortization	(27,156)	(20,843)
Net	18,664	14,684
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Cost	102,600	102,600
Accumulated Amortization	(85,173)	(73,770)
Net	17,427	28,830
Developed technology
Finite-Lived Intangible Assets [Line Items]
Cost	107,200	107,200
Accumulated Amortization	(90,319)	(81,383)
Net	16,881	25,817
Intangibles-in-progress
Finite-Lived Intangible Assets [Line Items]
Cost	9,574	6,391
Accumulated Amortization	0	0
Net	9,574	6,391
Purchased content
Finite-Lived Intangible Assets [Line Items]
Cost	52,440	47,298
Accumulated Amortization	(48,322)	(40,636)
Net	4,118	6,662
Lender licenses
Finite-Lived Intangible Assets [Line Items]
Cost	400	400
Accumulated Amortization	(367)	(217)
Net	$ 33	$ 183