Fair Value Measurements - Carrying Value and Estimated Fair Value of Notes Payable (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	$ 45,833
Carrying value	903,802	$ 857,842
Estimate of Fair Value Measurement [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	936,817	882,813
Estimate of Fair Value Measurement [Member] | Quoted Price in Active Markets for Identical Assets and Liabilities (Level 1)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	0	0
Estimate of Fair Value Measurement [Member] | Significant Other Observable Inputs (Level 2)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	0	0
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term Debt, Fair Value	936,817	882,813
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Carrying value	$ 903,802	$ 857,842