The contractor posted net third-quarter income of $50.6 million in the three months to September, up from $10.9 million in the 2011 period.
Backlog stood at $5.3 billion, up from $4.3 billion in the year-ago quarter but down from $5.7 billion in the second quarter of 2012.
"We see continued strength in our end markets and are encouraged by the significant level of bids and targeted market opportunities," chief executive Stephen Johnson said in a statement.
Revenue
