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Fair Value measurements - Summary of Carrying Values and Associated Fair Values of Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Carrying Value [Member]
Financial assets:
Investments		$ 16,688	$ 37,961
Carrying Value [Member] | 5.75% Senior Notes Due 2028 [Member]
Financial assets:
Senior Notes	[1]	300,000	300,000
Level 2 [Member]
Financial assets:
Investments		16,737	37,958
Level 2 [Member] | 5.75% Senior Notes Due 2028 [Member]
Financial assets:
Senior Notes	[1]	$ 304,635	$ 321,114
[1] Excludes the impact of unamortized debt issuance costs.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Fair value portion of notes payable.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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