Debt Agreements - Outstanding Debt Balances (Parenthetical) (Detail)	3 Months Ended
Mar. 31, 2020
Term Loan Facility due 2026 [Member]
Debt Instrument [Line Items]
Maturity date of debt instrument	May 22, 2026
Senior Notes due 2027 [Member]
Debt Instrument [Line Items]
Maturity date of debt instrument	Aug. 01, 2027
Exchangeable Senior Notes due 2022 [Member]
Debt Instrument [Line Items]
Maturity date of debt instrument	Mar. 15, 2022

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration