HMMT November 2014 H9

In equilateral triangle $A B C$ with side length 2 , let the parabola with focus $A$ and directrix $B C$ intersect sides $A B$ and $A C$ at $A_{1}$ and $A_{2}$, respectively. Similarly, let the parabola with focus $B$ and directrix $C A$ intersect sides $B C$ and $B A$ at $B_{1}$ and $B_{2}$, respectively. Finally, let the parabola with focus $C$ and directrix $A B$ intersect sides $C A$ and $C B$ at $C_{1}$ and $C_{2}$, respectively. Find the perimeter of the triangle formed by lines $A_{1} A_{2}, B_{1} B_{2}, C_{1} C_{2}$.