CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
Dec. 31, 2014	Nov. 20, 2013
CONDENSED STATEMENT OF STOCKHOLDERS' EQUITY
Sale of common stock to Sponsor, issue price (in dollars per share)		$ 0.004us-gaap_SaleOfStockPricePerShare
Sale of units	21,000,000
Sale of warrants to Sponsor	5,950,000
Sale of units pursuant to the underwriters' partial exercise of their over-allotment option	1,050,000
Sale of warrants to Sponsor pursuant to the underwriters' partial exercise of their over-allotment option	210,000

Represents the number of warrants or rights issued in conjunction with an initial public offering.

No definition available.

Name:	blvdu_ClassOfWarrantOrRightIssuedPursuantToInitialPublicOffering
Namespace Prefix:	blvdu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Represents the number of warrants or rights issued pursuant to the underwriters' partial exercise of their over-allotment option.

No definition available.

Name:	blvdu_ClassOfWarrantOrRightIssuedPursuantToUnderwritersPartialExerciseOfOverAllotmentOption
Namespace Prefix:	blvdu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Number of units issued during the period pursuant to initial public offering.

No definition available.

Name:	blvdu_UnitsIssuedDuringPeriodUnitsPursuantToInitialPublicOffering
Namespace Prefix:	blvdu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Number of units issued during the period pursuant to the underwriters' partial exercise of their over-allotment option.

No definition available.

Name:	blvdu_UnitsIssuedDuringPeriodUnitsPursuantToUnderwritersPartialExerciseOfOverAllotmentOption
Namespace Prefix:	blvdu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

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