To me, this demonstrates the success Insight has had with its model, and also shows the bifurcation of fundraising in the venture market: the haves and the have-nots. Those established firms that have consistently achieved superior returns for their funds are able to raise money quickly, while those firms that are new or don't have superior track records are left to fight with the sharks.
Here's a link to the Insight Venture Partners website:
Here are some links to articles discussing the Insight fundraising:
Business Insider: http://www.businessinsider.com/insight-venture-partners-has-closed-a-massive-new-257-billion-fund-2013-5