Robust growth continues in Arizona, Nevada and New Mexico, according to the results of ENR Southwest's annual survey of general contractors. The survey's top 10 firms reported combined revenue of more than $3.1 billion in 2014, up from $2.6 billion in 2013. Additionally, eight of the top 10 saw revenue increase last year, although three firms among last year's top 10 dropped to lower positions on the list.