Acquisition - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - eFront [Member] - USD ($) $ in Billions		6 Months Ended
May 10, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Settlement of outstanding debt	$ 0.2
Customer Relationships [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, weighed-average estimated useful life	11 years	11 years
Technology-Related [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, weighed-average estimated useful life	8 years	8 years
Trade Names [Member]
Business Acquisition [Line Items]
Finite-lived intangible assets, weighed-average estimated useful life	5 years	5 years

Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration