XML 184 R23.htm IDEA: XBRL DOCUMENT
v3.20.2

Inventory (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2020
Inventory Disclosure [Abstract] |
Schedule of Real Estate Inventory | A summary of inventory is as follows (in thousands):
| September 30, 2020 |  | December 31, 2019
Homes completed or under construction | $ | 302,070 |  |  | $ | 314,966 |
Land and lots - developed and under development | 470,791 |  |  | 437,553 |
Land held for sale | 6,499 |  |  | 1,048 |
Total inventory | $ | 779,360 |  |  | $ | 753,567 |
Summary of Real Estate Inventory Capitalized Interest Costs | A summary of interest costs incurred, capitalized and expensed is as follows (in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Interest capitalized at beginning of period | $ | 18,791 |  |  | $ | 17,199 |  | $ | 18,596 |  |  | $ | 14,780 |
Interest incurred | 2,010 |  |  | 3,052 |  | 7,677 |  |  | 9,066 |
Interest charged to cost of revenues | (2,999) |  |  | (2,324) |  | (8,471) |  |  | (5,919) |
Interest capitalized at end of period | $ | 17,802 |  |  | $ | 17,927 |  | $ | 17,802 |  |  | $ | 17,927 |
Capitalized interest as a percentage of inventory | 2.3 | % |  | 2.5 | % |  | 2.3 | % |  | 2.5 | %

X
- Definition Summary of Real Estate Inventory Capitalized Interest Costs [Table Text Block] + References No definition available. + Details
Name: | grbk_SummaryofRealEstateInventoryCapitalizedInterestCostsTableTextBlock
Namespace Prefix: | grbk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of real estate properties and units in those properties that are included in the discussion of the nature of an entity's operations. + References No definition available. + Details
Name: | us-gaap_ScheduleOfRealEstatePropertiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration