Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_ConvertibleDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Net Income per Share (Narrative) (Detail) - USD ($) $ in Thousands	8 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Nov. 22, 2016	Nov. 20, 2015
Debt Instrument [Line Items]
Antidilutive securities Excluded from Computation of Earnings Per Share (in Shares)			3,900,000
Stock Options [Member]
Debt Instrument [Line Items]
Antidilutive securities Excluded from Computation of Earnings Per Share (in Shares)	11,900,000	11,200,000
Restricted Stock [Member]
Debt Instrument [Line Items]
Antidilutive securities Excluded from Computation of Earnings Per Share (in Shares)	200,000	1,000,000.0	1,100,000
December 2021 Notes [Member]
Debt Instrument [Line Items]
Convertible Debt		$ 16,950		$ 2,462	$ 150,000	$ 150,000