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Supplemental Guarantor Information - Condensed Consolidating Statement of Operations (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,132,697 | $ 775,071 | $ 771,303 | $ 583,676 | $ 1,128,520 | $ 717,735 | $ 570,626 | $ 393,391 | $ 3,262,747 | $ 2,810,272 | $ 2,405,142
Other operations expense |  |  |  |  |  |  |  |  | 3,174 | 2,298 | 2,247
Sales and marketing |  |  |  |  |  |  |  |  | 187,267 | 137,066 | 127,903
General and administrative |  |  |  |  |  |  |  |  | 155,030 | 137,764 | 124,119
Homebuilding income from operations |  |  |  |  |  |  |  |  | 353,204 | 343,634 | 295,959
Equity in loss of unconsolidated entities |  |  |  |  |  |  |  |  | (393) | (11,433) | 179
Other (loss) income, net |  |  |  |  |  |  |  |  | (419) | 151 | 312
Homebuilding income before income taxes |  |  |  |  |  |  |  |  | 352,392 | 332,352 | 296,450
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 8,517 | 6,426 | 4,810
Financial services income before income taxes |  |  |  |  |  |  |  |  | 9,673 | 7,466 | 5,777
Income before income taxes |  |  |  |  |  |  |  |  | 362,065 | 339,818 | 302,227
Provision for income taxes |  |  |  |  |  |  |  |  | (90,552) | (152,267) | (106,094)
Equity of net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income | 100,984 | 63,969 | 63,680 | 42,880 | 74,242 | 72,289 | 32,803 | 8,217 | 271,513 | 187,551 | 196,133
Net income attributable to noncontrolling interests | (1,602) | 0 | 0 | 0 | (222) | (25) | (89) | (24) | (1,602) | (360) | (962)
Net income available to common stockholders | $ 99,382 | $ 63,969 | $ 63,680 | $ 42,880 | $ 74,020 | $ 72,264 | $ 32,714 | $ 8,193 | 269,911 | 187,191 | 195,171
Reporting Entity [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operations expense |  |  |  |  |  |  |  |  | 3,174 | 2,298 | 2,247
Sales and marketing |  |  |  |  |  |  |  |  | 138,674 | 102,780 | 98,811
General and administrative |  |  |  |  |  |  |  |  | 76,361 | 70,758 | 64,792
Homebuilding income from operations |  |  |  |  |  |  |  |  | 302,302 | 298,411 | 268,508
Equity in loss of unconsolidated entities |  |  |  |  |  |  |  |  | (393) | (11,433) | 179
Other (loss) income, net |  |  |  |  |  |  |  |  | 204 | 113 | 163
Homebuilding income before income taxes |  |  |  |  |  |  |  |  | 302,113 | 287,091 | 268,850
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 8,517 | 6,426 | 4,810
Financial services income before income taxes |  |  |  |  |  |  |  |  | 9,673 | 7,466 | 5,777
Income before income taxes |  |  |  |  |  |  |  |  | 311,786 | 294,557 | 274,627
Provision for income taxes |  |  |  |  |  |  |  |  | (77,468) | (129,766) | (94,772)
Equity of net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | 234,318 | 164,791 | 179,855
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | (1,602) | (360) | (962)
Net income available to common stockholders |  |  |  |  |  |  |  |  | 232,716 | 164,431 | 178,893
Reporting Entity [Member] | Issuer [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operations expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales and marketing |  |  |  |  |  |  |  |  | 48,593 | 34,286 | 29,092
General and administrative |  |  |  |  |  |  |  |  | 78,669 | 67,006 | 59,327
Homebuilding income from operations |  |  |  |  |  |  |  |  | 50,902 | 45,223 | 27,451
Equity in loss of unconsolidated entities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other (loss) income, net |  |  |  |  |  |  |  |  | (623) | 38 | 149
Homebuilding income before income taxes |  |  |  |  |  |  |  |  | 50,279 | 45,261 | 27,600
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financial services income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 50,279 | 45,261 | 27,600
Provision for income taxes |  |  |  |  |  |  |  |  | (13,084) | (22,501) | (11,322)
Equity of net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 232,716 | 164,431 | 178,893
Net income |  |  |  |  |  |  |  |  | 269,911 | 187,191 | 195,171
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income available to common stockholders |  |  |  |  |  |  |  |  | 269,911 | 187,191 | 195,171
Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other operations expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Sales and marketing |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative |  |  |  |  |  |  |  |  | 0 | 0 | 0
Homebuilding income from operations |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in loss of unconsolidated entities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other (loss) income, net |  |  |  |  |  |  |  |  | 0 | 0 | 0
Homebuilding income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in income of unconsolidated entities |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financial services income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Provision for income taxes |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity of net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (232,716) | (164,431) | (178,893)
Net income |  |  |  |  |  |  |  |  | (232,716) | (164,431) | (178,893)
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income available to common stockholders |  |  |  |  |  |  |  |  | (232,716) | (164,431) | (178,893)
Homebuilding |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 3,261,009 | 2,808,901 | 2,403,922
Homebuilding | Reporting Entity [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,187,417 | 1,881,654 | 1,680,736
Homebuilding | Reporting Entity [Member] | Issuer [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,073,592 | 927,247 | 723,186
Homebuilding | Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Home sales |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 3,244,087 | 2,732,299 | 2,329,336
Cost of home sales |  |  |  |  |  |  |  |  | 2,536,899 | 2,173,251 | 1,836,327
Home sales | Reporting Entity [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 2,170,495 | 1,805,052 | 1,606,150
Cost of home sales |  |  |  |  |  |  |  |  | 1,658,971 | 1,392,519 | 1,229,011
Home sales | Reporting Entity [Member] | Issuer [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 1,073,592 | 927,247 | 723,186
Cost of home sales |  |  |  |  |  |  |  |  | 877,928 | 780,732 | 607,316
Home sales | Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of home sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Land and lot sales |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 8,758 | 74,269 | 72,272
Cost of home sales |  |  |  |  |  |  |  |  | 25,435 | 14,888 | 17,367
Land and lot sales | Reporting Entity [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 8,758 | 74,269 | 72,272
Cost of home sales |  |  |  |  |  |  |  |  | 7,935 | 14,888 | 17,367
Land and lot sales | Reporting Entity [Member] | Issuer [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of home sales |  |  |  |  |  |  |  |  | 17,500 | 0 | 0
Land and lot sales | Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Home sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of home sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,164 | 2,333 | 2,314
Other operations | Reporting Entity [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 8,164 | 2,333 | 2,314
Other operations | Reporting Entity [Member] | Issuer [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operations | Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financial services |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,738 | 1,371 | 1,220
Cost of home sales |  |  |  |  |  |  |  |  | 582 | 331 | 253
Financial services | Reporting Entity [Member] | Guarantor Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,738 | 1,371 | 1,220
Cost of home sales |  |  |  |  |  |  |  |  | 582 | 331 | 253
Financial services | Reporting Entity [Member] | Issuer [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of home sales |  |  |  |  |  |  |  |  | 0 | 0 | 0
Financial services | Consolidating Adjustments [Member] |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 0 | 0 | 0
Cost of home sales |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 0

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