Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

+ Details

Name:	us-gaap_CommonStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

+ Details

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

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

+ Details

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

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_DividendsAxis=nlsnnv_InstallmentOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=nlsnnv_InstallmentTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=nlsnnv_InstallmentThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DividendsAxis=nlsnnv_InstallmentFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity - Schedule of Dividends Paid (Detail) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Dividends Payable [Line Items]
Dividend Per Share	$ 0.34	$ 0.31	$ 0.99	$ 0.90
Installment One
Dividends Payable [Line Items]
Declaration Date			Feb. 16, 2017		Feb. 18, 2016
Record Date			Mar. 02, 2017		Mar. 03, 2016
Payment Date			Mar. 16, 2017		Mar. 17, 2016
Dividend Per Share			$ 0.31		$ 0.28
Installment Two
Dividends Payable [Line Items]
Declaration Date			Apr. 24, 2017		Apr. 19, 2016
Record Date			Jun. 02, 2017		Jun. 02, 2016
Payment Date			Jun. 16, 2017		Jun. 16, 2016
Dividend Per Share			$ 0.34		$ 0.31
Installment Three
Dividends Payable [Line Items]
Declaration Date			Jul. 20, 2017		Jul. 21, 2016
Record Date			Aug. 24, 2017		Aug. 25, 2016
Payment Date			Sep. 07, 2017		Sep. 08, 2016
Dividend Per Share			$ 0.34		$ 0.31
Installment Four
Dividends Payable [Line Items]
Declaration Date					Oct. 20, 2016
Record Date					Nov. 22, 2016
Payment Date					Dec. 06, 2016
Dividend Per Share					$ 0.31