Leases - Summary of Supplemental Cash Flow and Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from finance leases	$ 2,617
Operating cash flows from operating leases	17,021
Finance cash flows from finance leases	$ 13,764	$ 11,631
Weighted-average remaining lease term - finance leases (years)	4 years 4 months 24 days
Weighted-average remaining lease term - operating leases (years)	6 years 4 months 24 days
Weighted-average discount rate - finance leases	3.40%
Weighted-average discount rate - operating leases	4.90%