Leases - Schedule of Future Minimum Annual Rentals under All Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease payments due:
Within one year		$ 7,577
After one but within two years		6,693
After two but within three years		5,358
After three but within four years		4,419
After four years but within five years		3,723
After five years		11,410
Total undiscounted cash flows		39,180
Discount on cash flows		(4,695)
Total operating lease liabilities	$ 35,168	$ 34,485