Leases (Supplemental Balance Sheet Information) (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 40,110	$ 41,754	$ 44,900
Operating lease liabilities	$ 41,144	$ 42,815	$ 46,100