Other Accrued Expenses and Current Liabilities - Other Accrued Expenses and Current Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Accrued legal and professional fees	$ 3,594	$ 3,860
Accrued customer-acquisition advertising costs (Note 1)	3,447	3,745
Accrued purchases	3,207	4,328
Accrued software costs	2,341	1,200
Accrued telephone charges	1,667	1,605
Accrued roadside assistance claim costs	1,632	1,709
Other	10,004	9,115
Total	31,994	29,330
Other Accrued Expenses and Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Financial derivatives (Note 12)	2,478	251
Symphony [Member]
Derivatives, Fair Value [Line Items]
Deferred Symphony acquisition purchase price (Note 4)	$ 3,624	$ 3,517