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Revenue Recognition - Additional Information (Detail) - USD ($)
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Uncollected billings related to long-term construction contracts $ 3,500,000 $ 5,000,000
Unbilled revenue for long-term contracts $ 0 $ 300,000
Minimum [Member]    
Disaggregation of Revenue [Line Items]    
Number of business days for the receipt of floor plan payment 5 days  
Maximum [Member]    
Disaggregation of Revenue [Line Items]    
Number of business days for the receipt of floor plan payment 10 days