Zipcar announced today that they have purchased foreign car sharing company, Denzel Mobility CarSharing GmbH. The Austrian-based car sharing company, which operates under the domain name CarSharing.at,  looks to become an integral piece in Zipcar’s growing international presence.

According to Reuters, Zipcar has been struggling in the global market and Europe in particular has become stagnant. With their latest acquisition, however, Zipcar can now tap into CarSharing.at’s 200 operational vehicles and 10,000 members. This bodes well for homegrown Zipcar because, based on research by Frost & Sullivan,  the car sharing market in Europe is poised to reach 5.5 million members with the potential to reach €2.6 billion in revenue.

Austria in particular was appealing to Zipcar because, according to president of Zipcar Europe Frerk-Malte Feller, “Vienna is a sophisticated city with great public transit, a government dedicated to sustainability and eco-conscious consumers and businesses.”

Zipcar is headquartered in Cambridge, MA and boasts 673,000 worldwide members. The deal brokered with CarSharing.at comes on the heels of Zipcar’s February transaction with Avancar in which Zipcar took a controlling stake in the Barcelona car sharing company.

As for the monetary details concerning the deal, it has not been publicized how much Zipcar paid for CarSharing.at but they note in the press release that the buyout will have no material impact on its 3Q or FY2012 results.