Revenue Recognition - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
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 21 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	$ 212.7	$ 149.4
Service revenues	958.2	939.0
Revenue recognized from contract liabilities	4.4	3.8
Retainage on contracts	8.5		$ 10.2
Service | COLORADO
Revenue Recognition [Line Items]
Service revenues	$ 14.5	$ 9.9
Minimum
Revenue Recognition [Line Items]
Warranty term	9 months	9 months
Minimum | Service
Revenue Recognition [Line Items]
Performance obligations, period	1 day
Maximum
Revenue Recognition [Line Items]
Warranty term	1 year	1 year
Maximum | Service
Revenue Recognition [Line Items]
Performance obligations, period	21 months