Summary of Significant Accounting Policies - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019 Segment
Summary Of Significant Accounting Policies [Line Items]
Operating lease option to extend description	options to extend the leases in 5 to 10 year increments for up to 10 years.
Operating lease, existence of option to extend	true
Operating lease existence of option to terminate	true
Number of operating segment	1
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating lease remaining term	1 year
Operating lease option to extend	5 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Operating lease remaining term	13 years
Operating lease option to extend	10 years