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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenue from Contract with Customer [Abstract] |
Summary of Revenues Disaggregated by End Market and Product | The following tables present our revenues disaggregated by end market and product for the three months ended March 31 (in thousands):
|  | 2018 |  |  |  |  |  | 2017(1) |  |  |  |
Residential and multi-family |  | $ | 250,114 |  |  |  | 83 | % |  | $ | 209,391 |  |  |  | 82 | %
Commercial |  |  | 51,614 |  |  |  | 17 | % |  |  | 46,278 |  |  |  | 18 | %
Net revenues |  | $ | 301,728 |  |  |  | 100 | % |  | $ | 255,669 |  |  |  | 100 | %
|  | 2018 |  |  |  |  |  | 2017(1) |  |  |  |
Insulation |  | $ | 202,275 |  |  |  | 67 | % |  | $ | 175,623 |  |  |  | 69 | %
Waterproofing |  |  | 22,606 |  |  |  | 7 | % |  |  | 21,005 |  |  |  | 8 | %
Shower doors, shelving and mirrors |  |  | 20,260 |  |  |  | 7 | % |  |  | 12,885 |  |  |  | 5 | %
Garage doors |  |  | 15,466 |  |  |  | 5 | % |  |  | 14,287 |  |  |  | 6 | %
Rain gutters |  |  | 8,658 |  |  |  | 3 | % |  |  | 8,442 |  |  |  | 3 | %
Other building products |  |  | 32,463 |  |  |  | 11 | % |  |  | 23,427 |  |  |  | 9 | %
Net revenues |  | $ | 301,728 |  |  |  | 100 | % |  | $ | 255,669 |  |  |  | 100 | %
(1) | As noted above, prior period amounts have not been adjusted under the modified retrospective method.
Summary of Assets and Liabilities Related to Uncompleted Contracts and Customer Deposits | Contract assets and liabilities related to our uncompleted contracts and customer deposits were as follows as of March 31 and December 31 (in thousands):
|  | 2018 |  |  | 2017 |
Contract assets |  | $ | 18,101 |  |  | $ | 6,182 |
Contract liabilities |  |  | (6,963 | ) |  |  | (4,376 | )
Schedule of Cost and Estimated Earnings on Uncompleted Contracts | Uncompleted contracts were as follows for the three months ended March 31 and December 31 (in thousands):
|  | 2018 |  |  | 2017 |
Costs incurred on uncompleted contracts |  | $ | 102,088 |  |  | $ | 79,235 |
Estimated earnings |  |  | 55,882 |  |  |  | 44,035 |
Total |  |  | 157,970 |  |  |  | 123,270 |
Less: Billings to date |  |  | 144,506 |  |  |  | 121,464 |
Net under (over) billings |  | $ | 13,464 |  |  | $ | 1,806 |
Schedule of Net Under (Over) Billings | Net under (over) billings were as follows as of March 31 and December 31 (in thousands):
|  | 2018 |  |  | 2017 |
Costs and estimated earnings in excess of billings on uncompleted contracts (contract assets) |  | $ | 18,101 |  |  | $ | 6,182 |
Billings in excess of costs and estimated earnings on uncompleted contracts (contract liabilities) |  |  | (4,637 | ) |  |  | (4,376 | )
Net under (over) billings |  | $ | 13,464 |  |  | $ | 1,806 |

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