Fair Value of Financial Instruments - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Asset/Liability
Assets, fair value	$ 82,679	$ 76,987
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,125	546
Interest Rate Swap [Member]
Fair Value, Asset/Liability
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,125	546
Convertible debt investment
Fair Value, Asset/Liability
Assets, fair value	54,524	49,542
Level 2
Fair Value, Asset/Liability
Assets, fair value	28,155	27,445
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,125	546
Level 2 | Interest Rate Swap [Member]
Fair Value, Asset/Liability
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,125	546
Level 3
Fair Value, Asset/Liability
Assets, fair value	54,524	49,542
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Level 3 | Interest Rate Swap [Member]
Fair Value, Asset/Liability
Financial and Nonfinancial Liabilities, Fair Value Disclosure		0
Level 3 | Convertible debt investment
Fair Value, Asset/Liability
Assets, fair value	54,524	49,542
Deferred Compensation Plan Assets [Member]
Fair Value, Asset/Liability
Assets, fair value	28,155	27,445
Deferred Compensation Plan Assets [Member] | Level 2
Fair Value, Asset/Liability
Assets, fair value	$ 28,155	$ 27,445