Schedule of Future Guaranteed Payments (Detail) (USD $)	Sep. 30, 2014
Liabilities for Guarantees on Long-Duration Contracts [Line Items]
2014	$ 1,000,000
2015	4,000,000
2016	6,000,000
2017	10,000,000
Less: discount to present value	(3,537,951)
Guaranteed payments, net of discount	$ 17,462,049

Guaranteed benefit liability discount value.

No definition available.

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Namespace Prefix:	invt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Guaranteed benefit liability future minimum payments due current.

+ References

No definition available.

+ Details

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Namespace Prefix:	invt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Guaranteed benefit liability future minimum payments due in four years.

+ References

No definition available.

+ Details

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Namespace Prefix:	invt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Guaranteed benefit liability future minimum payments due in three years.

+ References

No definition available.

+ Details

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Namespace Prefix:	invt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Guaranteed benefit liability future minimum payments due in two years.

+ References

No definition available.

+ Details

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Namespace Prefix:	invt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date, net of reinsurance recoverables, for all guaranteed benefit types.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 80

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 20

-Section 55

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389

+ Details

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Balance Type:	credit
Period Type:	instant

- Details

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