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Fair Value measurements - Summary of Carrying Values and Associated Fair Values of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying Value [Member] |  |  |
Financial assets: |  |  |
Investments |  | $ 4,980 | $ 10,060
Carrying Value [Member] | 5.75% Senior Notes Due 2028 [Member] |  |  |
Financial assets: |  |  |
Senior Notes | [1] | 300,000 |
Level 2 [Member] |  |  |
Financial assets: |  |  |
Investments |  | 4,983 | 10,053
Level 2 [Member] | 5.75% Senior Notes Due 2028 [Member] |  |  |
Financial assets: |  |  |
Senior Notes | [1] | $ 309,000 |
[1] | Excludes the impact of unamortized debt issuance costs.

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