Schedule of Future Undiscounted Cash Flows to be Received from Third-Party Lessees for Company's Operating Leases (Detail) - Accounting Standards Update 2016-02 $ in Thousands	Mar. 31, 2019 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
2019 (remainder)	$ 55,941
2020	73,904
2021	67,541
2022	61,108
2023	58,671
Thereafter	$ 410,147