how to copy the databases from sql server 2005 in windows server 2003 to sql server 2014 in windows 2012 r2

I was used sql server 2005 in old windows server 2003,Now I purchased the windows server 2012 R2.In that windows server R2 uses sql server 2014,so I want to copy the all databases to sql server 2014 from sql server 2003.Please suggest me.

Thank you in Advanced