Basis of Presentation and Recently Issued Accounting Standards - Additional Information (Detail)	3 Months Ended
Mar. 31, 2020 Segment
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Number of operating segments	3
VNext [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, effective date of acquisition	Feb. 28, 2020
PCM [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, effective date of acquisition	Aug. 30, 2019

Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e848-128460

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e845-128460

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration