Supplemental Balance Sheet Information Related to Operating Leases (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets in other assets	$ 12,257
Operating lease liabilities in other current liabilities	3,264
Operating lease liabilities in other long-term liabilities	9,439
Total operating lease liabilities	$ 12,703