Leases and Other Finance Obligations - Other Finance Obligations - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($) Property
Other Finance Obligations [Line Items]
Number of leased properties with single lessor | Property	140
Other finance obligation, expiration year	2021
Other finance obligation, renewal term	5 years
Total lease term	30 years
Master lease agreement description	Company is party to 140 individual property lease agreements with a single lessor as of June 30, 2019. These lease agreements have initial terms ranging from nine to 15 years (expiring through 2021) and renewal options in five-year increments providing for up to approximately 30-year total lease terms.
Other finance obligations	$ 222.9
Payment of other finance obligation	$ 10.5
Minimum
Other Finance Obligations [Line Items]
Other finance obligation, term	9 years
Maximum
Other Finance Obligations [Line Items]
Other finance obligation, term	15 years