Leases - Summary of Information Relates to Operating and Finance Leases Recorded (Detail)	6 Months Ended
	Jun. 30, 2019
Leases [Line Items]
Operating leases, Weighted average remaining lease term	4 years 10 months 24 days
Operating leases, Weighted average discount rate	4.30%
Finance leases, Weighted average remaining lease term	14 years 3 months 18 days
Finance leases, Range of remaining lease terms	14 years 3 months 18 days
Finance leases, Weighted average discount rate	7.90%
Minimum
Leases [Line Items]
Operating leases, Range of remaining lease terms	1 month 6 days
Maximum [Member]
Leases [Line Items]
Operating leases, Range of remaining lease terms	9 years 1 month 6 days