Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
Dec. 31, 2016 |
|
Accounting Policies and General Information [Line Items] | |||||
Advertising expenses | $ 0.8 | $ 0.8 | $ 2.4 | $ 2.2 | |
Other Non-Current Assets [Member] | |||||
Accounting Policies and General Information [Line Items] | |||||
Retainage receivables | 0.6 | 0.6 | |||
Accounts Receivable [Member] | |||||
Accounting Policies and General Information [Line Items] | |||||
Retainage receivables | $ 22.1 | $ 22.1 | $ 10.3 |