Receivables, Net (Tables)

3 Months Ended

Mar. 31, 2018

Receivables [Abstract]

Summary of Receivables

(in thousands)	March 31, 2018		December 31, 2017		March 31, 2017
Construction contracts completed and in progress:
Billed	$	214,494	$	252,467	$	142,216
Unbilled		73,128		77,135		85,098
Retentions		—		91,135		82,692
Total construction contracts completed and in progress		287,622		420,737		310,006
Construction material sales		28,233		42,192		25,582
Other		14,442		17,014		15,977
Total gross receivables		330,297		479,943		351,565
Less: allowance for doubtful accounts		105		152		474
Total net receivables	$	330,192	$	479,791	$	351,091