Investments and other assets - Components of Investments and Other Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments, All Other Investments [Abstract]
Cash value life insurance	$ 52,462	$ 50,452
Equity method investments	27,650	41,420
Other equity investments	32,383	24,497
Deferred debt issuance costs	10,921	9,350
Other long-term assets	21,853	17,746
Total	$ 145,269	$ 143,465