Summary of Estimated Fair Values of Separately Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - Oncura	Jan. 08, 2016
Trade names
Business Acquisition [Line Items]
Weighted average useful life	5 years
Customer relationships
Business Acquisition [Line Items]
Weighted average useful life	6 years

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration