This can be achieved using the command nohup

nohup <command> <args> ><filename> 2>&1 &

e.g.
 nohup /usr/bin/terminator -m -T 'main_terminal' -l My_Layout > /dev/null 2>&1 &

Source: http://stackoverflow.com/questions/13676457/how-can-i-put-the-current-running-linux-process-in-background