Line of Credit, Long-Term Debt and Finance Lease Obligations - Summary of Estimated Fair Value of Notes (Detail) - Level 2 [Member] - Estimate of Fair Value Measurement [Member] - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
5.25% Senior Unsecured Notes Due 2023 [Member]
Debt Instrument Fair Value [Line Items]
Estimated fair value	$ 766,875	$ 736,725
6.25% Senior Unsecured Notes Due 2027 [Member]
Debt Instrument Fair Value [Line Items]
Estimated fair value	$ 1,025,600	$ 482,500