Leases - Schedule of Other Information (Detail)	Sep. 30, 2019 USD ($)
Weighted average remaining lease term (in years):
Operating leases	8 years
Financing leases	4 years 2 months 12 days
Weighted average discount rate:
Operating leases	5.20%
Financing leases	5.40%
Additional leases not yet commenced (undiscounted):
Operating lease liability to commence in the remainder of 2019	$ 0