Statement of Shareholders' Equity (Statement) - USD ($) $ in Thousands	Total	Additional Paid-in Capital [Member]	Common Stock [Member]	Retained Earnings	Noncontrolling Interest
Statement of Stockholders' Equity [Abstract]
Additional Paid in Capital	$ 290,799
Treasury Stock, Value	$ 3,167
Treasury Stock, Common, Shares	391,939
Common Stock, Shares, Issued	50,879,949
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 509
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	50,879,949
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 509
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 290,799
Retained Earnings (Accumulated Deficit)	235,027
Stockholders' Equity Attributable to Parent	523,168
Stockholders' Equity Attributable to Noncontrolling Interest	13,227
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 536,395
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	249,617
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1,601	$ 1,598	$ 3
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ 592	(591)	(1)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	75,708
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 218
Temporary Equity, Accretion to Redemption Value, Adjustment		863
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	5,251
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	747
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	50,311
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	218
Temporary Equity, Accretion to Redemption Value, Adjustment		863
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	592	(591)	(1)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1,601	1,598	3
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	249,617
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	75,708
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 218
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	5,251
Net income attributable to Green Brick Partners, Inc.	49,564
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	747
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	50,311
Noncontrolling Interest, Increase from Business Combination	400
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	218
Payment for Contingent Consideration Liability, Operating Activities	5,267
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	937
Additional Paid in Capital	294,695
Treasury Stock, Value	$ 3,167
Treasury Stock, Common, Shares	391,939
Common Stock, Shares, Issued	51,008,861
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 510
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	51,008,861
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 510
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 294,695
Retained Earnings (Accumulated Deficit)	250,944
Stockholders' Equity Attributable to Parent	542,982
Stockholders' Equity Attributable to Noncontrolling Interest	10,900
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 553,882
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	44,997
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1		1
APIC, Share-based Payment Arrangement, Increase for Cost Recognition		84
Temporary Equity, Accretion to Redemption Value, Adjustment		(1,892)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	2,281
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	504
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	34,151
Temporary Equity, Accretion to Redemption Value, Adjustment		(1,892)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1		1
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	44,997
APIC, Share-based Payment Arrangement, Increase for Cost Recognition		84
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ 2,281
Net income attributable to Green Brick Partners, Inc.	33,647
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	504
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	34,151
Noncontrolling Interest, Change in Redemption Value	1,892
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent	937				$ (937)
Additional Paid in Capital	292,887	292,887
Treasury Stock, Value	$ 3,167
Treasury Stock, Common, Shares	391,939
Common Stock, Shares, Issued	51,053,858
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511		511
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	51,053,858
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511		511
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 292,887	292,887
Retained Earnings (Accumulated Deficit)	285,528
Stockholders' Equity Attributable to Parent	575,759
Stockholders' Equity Attributable to Noncontrolling Interest	8,186
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	583,945
Additional Paid in Capital	293,242
Treasury Stock, Value	$ 3,167
Treasury Stock, Common, Shares	391,939
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 7.49
Common Stock, Shares, Issued	51,053,858
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	51,053,858
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 293,242
Retained Earnings (Accumulated Deficit)	349,656
Stockholders' Equity Attributable to Parent	640,242
Stockholders' Equity Attributable to Noncontrolling Interest	9,167
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 649,409
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	3 years 3 months 29 days
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	139,371
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 2,437	2,436	1
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ 834	833	(1)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	41,318
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 319
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	1,606
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	6,741
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 84,973
Granted (in shares)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	0
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	3 years 3 months 29 days
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ 834	833	(1)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 2,437	2,436	$ 1
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	139,371
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	41,318
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 319
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	1,606
Net income attributable to Green Brick Partners, Inc.	78,232
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	6,741
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	84,973
Noncontrolling Interest, Change in Redemption Value	(3,007)	(3,007)
Payment for Contingent Consideration Liability, Operating Activities	368
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent				$ 937	$ (937)
Additional Paid in Capital	293,162
Treasury Stock, Value	$ 3,167
Treasury Stock, Common, Shares	391,939
Common Stock, Shares, Issued	51,124,215
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	51,124,215
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 293,162
Retained Earnings (Accumulated Deficit)	375,625
Stockholders' Equity Attributable to Parent	666,131
Stockholders' Equity Attributable to Noncontrolling Interest	10,630
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 676,761
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	27,696
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 173
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	1,606
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	5,278
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 57,541
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	27,696
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 173
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	1,606
Net income attributable to Green Brick Partners, Inc.	52,263
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	5,278
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	57,541
Noncontrolling Interest, Change in Redemption Value	1,178	$ (1,178)
Additional Paid in Capital	292,157
Treasury Stock, Value	$ 3,167
Treasury Stock, Common, Shares	391,939
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 7.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 7,625
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 7.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 7,625
Common Stock, Shares, Issued	51,151,911
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	51,151,911
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,151,911 and 51,053,858 issued and 50,759,972 and 50,661,919 outstanding as of June 30, 2021 and December 31, 2020, respectively	$ 511
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 292,157
Retained Earnings (Accumulated Deficit)	427,888
Stockholders' Equity Attributable to Parent	717,389
Stockholders' Equity Attributable to Noncontrolling Interest	14,302
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 731,691