v2.4.0.8

Fair Value Measurements of Financial Assets and Liabilities - Additional Information (Detail) (USD $)	9 Months Ended			12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Short-term Investments	Dec. 31, 2013 Short-term Investments
Impairment charge	$ 66,000	$ 155,000	$ 0	$ 0
Maturity period of short term investments	Beyond 90 days
Stated maturity period of short term investments	One year or more

X

- Definition

Maturity period of short term investments.

+ References

No definition available.

+ Details

Name:	birt_MaturityPeriodOfShortTermInvestments
Namespace Prefix:	birt_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stated maturity period of short term investments.

+ References

No definition available.

+ Details

Name:	birt_StatedMaturityPeriodOfShortTermInvestments
Namespace Prefix:	birt_
Data Type:	us-types:durationStringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The charge against earnings resulting from the write down of long lived assets other than goodwill due to the difference between the carrying value and lower fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230

+ Details

Name:	us-gaap_OtherAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration