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Segment Disclosures - Profit before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | $ 208,968 | $ 144,720 | $ 341,129 | $ 248,032
Equity-based compensation expense |  |  | (21,467) | (21,378)
Corporate interest expense | (5,914) | (4,814) | (11,750) | (9,902)
Homebuilding [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 191,337 | 131,528 | 308,527 | 225,182
Corporate interest expense | (5,641) | (4,554) | (11,219) | (9,396)
Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 17,631 | 13,192 | 32,602 | 22,850
Corporate interest expense | (273) | (260) | (531) | (506)
Operating Segments [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 191,634 | 129,162 | 317,910 | 225,730
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 | 100,621 | 63,730 | 165,109 | 110,339
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 | 14,112 | 5,578 | 23,218 | 9,643
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 | 35,986 | 30,056 | 58,145 | 52,789
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 | 22,911 | 15,825 | 37,481 | 28,611
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 18,004 | 13,973 | 33,957 | 24,348
Corporate and Reconciling Items [Member] |  |  |  |
Segment Reporting Reconciling Item For Operating Profit Loss From Segment To Consolidated [Line Items] |  |  |  |
Profit before taxes | 17,334 | 15,558 | 23,219 | 22,302
Contract land deposit reserve adjustment | (2,064) | 1,307 | (2,792) | 2,636
Equity-based compensation expense | (10,878) | (10,829) | (21,467) | (21,378)
Corporate capital allocation | 49,646 | 46,259 | 95,833 | 90,574
Unallocated corporate overhead | (23,360) | (26,517) | (50,594) | (56,026)
Consolidation adjustments and other | 9,614 | 9,877 | 13,427 | 15,862
Corporate interest expense | (5,624) | (4,539) | (11,188) | (9,366)
Corporate and 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 | 31,005 | 28,766 | 60,130 | 55,951
Corporate and 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 | 4,133 | 4,447 | 7,947 | 9,400
Corporate and 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 | 7,535 | 7,458 | 14,277 | 14,157
Corporate and 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 | $ 6,973 | $ 5,588 | $ 13,479 | $ 11,066

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