Unearned Revenue (Tables)

9 Months Ended

Sep. 30, 2018

Deferred Revenue Disclosure [Abstract]

Schedule of Unearned Revenue

The following tables present our unearned revenue as of the respective periods (in thousands):

September 30, 2018

	Transportation		Water		Specialty		Total
California	$	299,242	$	11,297	$	50,283	$	360,822
Northwest		242,666		10		70,600		313,276
Heavy Civil		1,678,637		26,914		—		1,705,551
Federal		23		—		145,483		145,506
Midwest		91,144		405		235,190		326,739
Water and Mineral Services		—		211,531		—		211,531
Total	$	2,311,712	$	250,157	$	501,556	$	3,063,425

June 30, 2018

	Transportation		Water		Specialty		Total
California	$	332,252	$	17,485	$	47,601	$	397,338
Northwest		315,189		206		68,461		383,856
Heavy Civil		1,882,806		32,214		—		1,915,020
Federal		26		—		161,073		161,099
Midwest		64,191		625		268,809		333,625
Water and Mineral Services		—		225,402		—		225,402
Total	$	2,594,464	$	275,932	$	545,944	$	3,416,340

January 1, 2018

	Transportation		Water		Specialty		Total
California	$	299,552	$	27,328	$	79,176	$	406,056
Northwest		273,864		2,606		39,112		315,582
Heavy Civil		2,194,430		38,183		—		2,232,613
Federal		317		4,212		162,641		167,170
Midwest		90,584		1,961		365,767		458,312
Water and Mineral Services		—		4,116		—		4,116
Total	$	2,858,747	$	78,406	$	646,696	$	3,583,849