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Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | $ 661,697 | $ 603,212 | $ 453,546
Equity-based compensation expense | (43,598) | (54,091) | (63,227)
Corporate interest expense | (21,707) | (23,559) | (23,140)
Homebuilding [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 601,102 | 555,329 | 427,884
Corporate interest expense | (20,621) | (22,918) | (22,591)
Mortgage Banking [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 60,595 | 47,883 | 25,662
Corporate interest expense | (1,086) | (641) | (549)
Operating Segments [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 579,095 | 555,699 | 420,806
Corporate interest expense | (191,146) | (171,860) | (152,736)
Operating Segments [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 301,173 | 322,829 | 271,965
Corporate interest expense | (119,808) | (107,748) | (96,364)
Operating Segments [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 21,947 | 37,914 | 33,390
Corporate interest expense | (18,141) | (16,991) | (12,114)
Operating Segments [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 121,166 | 86,336 | 47,538
Corporate interest expense | (28,307) | (27,263) | (26,300)
Operating Segments [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 71,098 | 57,384 | 37,525
Corporate interest expense | (23,804) | (19,217) | (17,409)
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 63,711 | 51,236 | 30,388
Corporate interest expense | (1,086) | (641) | (549)
Reconciling Items [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 82,602 | 47,513 | 32,740
Contract land deposit reserve adjustment | 10,933 | 13,805 | 3,612
Equity-based compensation expense | (43,598) | (54,091) | (63,227)
Corporate capital allocation | 189,992 | 171,170 | 152,140
Unallocated corporate overhead | (89,376) | (83,124) | (61,108)
Consolidation adjustments and other | 35,204 | 22,622 | 23,867
Corporate interest expense | (20,553) | (22,869) | (22,544)
Reconciling Items [Member] | Homebuilding [Member] | Mid Atlantic [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Corporate capital allocation | 119,758 | 107,705 | 96,328
Reconciling Items [Member] | Homebuilding [Member] | North East [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Corporate capital allocation | 18,132 | 16,987 | 12,107
Reconciling Items [Member] | Homebuilding [Member] | Mid East [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Corporate capital allocation | 28,303 | 27,263 | 26,299
Reconciling Items [Member] | Homebuilding [Member] | South East [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Corporate capital allocation | $ 23,799 | $ 19,215 | $ 17,406

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