Contractual interest rate for funds borrowed, under the debt agreement.

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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Summary of Senior Subordinated Convertible Obligations - Non- Printing (Detail)	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2017	Oct. 15, 2013
1.50% Senior Subordinated Convertible Notes Due in October 2020
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.50%	1.50%		150.00%
0.599% Senior Subordinated Convertible Notes Due in August 2024
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	0.599%	0.599%	0.599%