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	$ 291,299
Treasury Stock, Value	$ 981
Treasury Stock, Common, Shares	136,756
Common Stock, Shares, Issued	50,719,884
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 507
Treasury Stock, Value	$ 981
Common Stock, Shares, Issued	50,719,884
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 507
Treasury Stock, Common, Shares	136,756
Additional Paid in Capital	$ 291,299
Retained Earnings (Accumulated Deficit)	177,526
Stockholders' Equity Attributable to Parent	468,351
Stockholders' Equity Attributable to Noncontrolling Interest	17,281
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 485,632
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	219,181
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1,467	$ 1,464	$ 3
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	$ 545	544	(1)
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	59,116
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 218
Temporary Equity, Accretion to Redemption Value, Adjustment		(2,840)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	10,993
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(1,115)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	25,950
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	142
Temporary Equity, Accretion to Redemption Value, Adjustment		(2,840)
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation	545	544	(1)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1,467	1,464	3
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	219,181
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	59,116
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	$ 218
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	10,993
Net income attributable to Green Brick Partners, Inc.	27,065
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	(1,115)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 25,950
Stock Repurchased During Period, Shares	(47,182)
Stock Repurchased During Period, Value	$ (388)
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	142
Payment for Contingent Consideration Liability, Operating Activities	1,332
Additional Paid in Capital	291,271
Treasury Stock, Value	$ 1,041
Treasury Stock, Common, Shares	144,618
Common Stock, Shares, Issued	50,820,548
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 508
Treasury Stock, Value	$ 1,041
Common Stock, Shares, Issued	50,820,548
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 508
Treasury Stock, Common, Shares	144,618
Additional Paid in Capital	$ 291,271
Retained Earnings (Accumulated Deficit)	190,131
Stockholders' Equity Attributable to Parent	480,869
Stockholders' Equity Attributable to Noncontrolling Interest	4,788
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 485,657
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	59,401
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1		1
APIC, Share-based Payment Arrangement, Increase for Cost Recognition		117
Temporary Equity, Accretion to Redemption Value, Adjustment		(1,720)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	258
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	643
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	15,103
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	71	71
Temporary Equity, Accretion to Redemption Value, Adjustment		(1,720)
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1		1
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	59,401
APIC, Share-based Payment Arrangement, Increase for Cost Recognition		117
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders	$ 258
Net income attributable to Green Brick Partners, Inc.	14,460
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	643
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	$ 15,103
Stock Repurchased During Period, Shares	(39,320)
Stock Repurchased During Period, Value	$ (328)
APIC, Share-based Payment Arrangement, Option, Increase for Cost Recognition	71	71
Additional Paid in Capital	289,739	289,739
Treasury Stock, Value	$ 1,369
Treasury Stock, Common, Shares	183,938
Common Stock, Shares, Issued	50,879,949
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 509		509
Treasury Stock, Value	$ 1,369
Common Stock, Shares, Issued	50,879,949
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 509		509
Treasury Stock, Common, Shares	183,938
Additional Paid in Capital	$ 289,739	289,739
Retained Earnings (Accumulated Deficit)	204,591
Stockholders' Equity Attributable to Parent	493,470
Stockholders' Equity Attributable to Noncontrolling Interest	5,173
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	498,643
Additional Paid in Capital	290,799
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	50,879,949
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 509
Additional Paid in Capital, Common Stock	290,799
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	50,879,949
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, 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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	4 years 3 months 25 days
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
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
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	4 years 3 months 25 days
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, Change in Redemption Value	863	863
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			$ 937	$ (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; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, 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; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, 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	0	1
APIC, Share-based Payment Arrangement, Increase for Cost Recognition	84
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
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture	$ 1	0	$ 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, Increase from Business Combination	400
Noncontrolling Interest, Change in Redemption Value		$ (1,892)
Additional Paid in Capital	292,887
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	$ 2,180
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	$ 2,180
Common Stock, Shares, Issued	51,053,858
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 511
Additional Paid in Capital, Common Stock	292,887
Treasury Stock, Value	$ 3,167
Common Stock, Shares, Issued	51,053,858
Common stock, $0.01 par value: 100,000,000 shares authorized; 51,053,858 and 50,879,949 issued and 50,661,919 and 50,488,010 outstanding as of June 30, 2020 and December 31, 2019, respectively	$ 511
Treasury Stock, Common, Shares	391,939
Additional Paid in Capital	$ 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