Revenue Recognition - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Revenue Recognition [Line Items]
Performance obligations, description of timing	Performance obligations within paving service agreements are satisfied over time, primarily ranging from one day to 20 months. For product revenues and freight revenues, customer payment terms are generally 30 days from invoice date. Customer payments for the paving operations are based on a contractual billing schedule and are due 30 days from invoice date.
Product and freight revenues customer payment terms	30 days
Customer payments terms based on contractual billing	30 days
Future revenues from unsatisfied performance obligations	$ 149,400	$ 88,100
Service revenues	938,955	802,004
Revenue recognized from contract liabilities	3,800	4,200
Retainage on contracts	5,400		$ 7,500
COLORADO
Revenue Recognition [Line Items]
Service revenues	$ 9,900	$ 11,100
Minimum
Revenue Recognition [Line Items]
Warranty term	9 months
Minimum | Service
Revenue Recognition [Line Items]
Performance obligations, period	1 day
Maximum
Revenue Recognition [Line Items]
Warranty term	1 year
Maximum | Service
Revenue Recognition [Line Items]
Performance obligations, period	20 months