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Segment Information, Nature of Operations, and Certain Concentrations - Profit before Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | $ 603,212 | $ 453,546 | $ 418,696
Equity-based compensation expense | (54,091) | (63,227) | (34,296)
Corporate interest expense | (23,559) | (23,140) | (22,385)
Homebuilding [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 555,329 | 427,884 | 379,370
Corporate interest expense | (22,918) | (22,591) | (21,840)
Mortgage Banking [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 47,883 | 25,662 | 39,326
Corporate interest expense | (641) | (549) | (545)
Operating Segments [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 555,699 | 420,806 | 423,306
Corporate interest expense | (171,860) | (152,736) | (117,100)
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 | 322,829 | 271,965 | 276,399
Corporate interest expense | (107,748) | (96,364) | (72,351)
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 | 37,914 | 33,390 | 14,294
Corporate interest expense | (16,991) | (12,114) | (9,466)
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 | 86,336 | 47,538 | 55,537
Corporate interest expense | (27,263) | (26,300) | (22,587)
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 | 57,384 | 37,525 | 35,001
Corporate interest expense | (19,217) | (17,409) | (12,151)
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 51,236 | 30,388 | 42,075
Corporate interest expense | (641) | (549) | (545)
Reconciling Items [Member] |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |
Profit before taxes | 47,513 | 32,740 | (4,610)
Contract land deposit reserve adjustment | 13,805 | 3,612 | 5,313
Equity-based compensation expense | (54,091) | (63,227) | (34,296)
Corporate capital allocation | 171,170 | 152,140 | 116,458
Unallocated corporate overhead | (83,124) | (61,108) | (72,703)
Consolidation adjustments and other | 22,622 | 23,867 | 2,361
Corporate interest expense | (22,869) | (22,544) | (21,743)
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 | 107,705 | 96,328 | 72,272
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 | 16,987 | 12,107 | 9,461
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 | 27,263 | 26,299 | 22,580
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 | $ 19,215 | $ 17,406 | $ 12,145

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