Property and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 27,223	$ 19,849	$ 52,312	$ 40,800
Capitalized developed software costs	15,800	9,100	30,300	17,300
Property And Equipment Excluding Developed Software
Property Plant And Equipment [Line Items]
Depreciation and amortization	7,400	5,400	13,600	10,500
Developed software
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 7,900	$ 4,800	$ 14,900	$ 9,200