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Segment Information, Nature of Operations, and Certain Concentrations - Segment Reporting, Other Significant Reconciling Items (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Interest Income: |  |  |
Consolidated interest income | $ 7,302 | $ 5,892 | $ 8,904
Interest Expense: |  |  |
Consolidated interest expense | 22,385 | 7,529 | 1,892
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 13,391 | 8,100 | 6,672
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 19,016 | 12,365 | 11,444
Corporate capital allocation | 116,457 | 91,507 | 71,226
Mortgage Banking [Member] |  |  |
Interest Income: |  |  |
Interest income | 4,983 | 4,504 | 5,702
Interest Expense: |  |  |
Consolidated interest expense | 545 | 546 | 875
Operating Segments [Member] |  |  |
Interest Income: |  |  |
Interest income | 4,983 | 4,504 | 5,702
Interest Expense: |  |  |
Consolidated interest expense | 117,100 | 92,240 | 72,403
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 9,225 | 7,195 | 6,184
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 18,278 | 9,613 | 11,237
Operating Segments [Member] | Homebuilding Mid Atlantic [Member] |  |  |
Interest Expense: |  |  |
Consolidated interest expense | 72,351 | 59,310 | 48,971
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 4,784 | 3,886 | 3,353
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 7,947 | 3,595 | 3,784
Corporate capital allocation | 72,271 | 59,144 | 48,697
Operating Segments [Member] | Homebuilding North East [Member] |  |  |
Interest Expense: |  |  |
Consolidated interest expense | 9,466 | 8,196 | 5,776
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 853 | 631 | 409
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 1,454 | 1,703 | 424
Corporate capital allocation | 9,461 | 8,187 | 5,763
Operating Segments [Member] | Homebuilding Mid East [Member] |  |  |
Interest Expense: |  |  |
Consolidated interest expense | 22,587 | 15,043 | 11,080
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 1,911 | 1,473 | 1,398
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 3,282 | 1,886 | 5,611
Corporate capital allocation | 22,580 | 15,039 | 11,074
Operating Segments [Member] | Homebuilding South East [Member] |  |  |
Interest Expense: |  |  |
Consolidated interest expense | 12,151 | 9,145 | 5,701
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 1,008 | 808 | 729
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 2,662 | 1,260 | 369
Corporate capital allocation | 12,145 | 9,137 | 5,692
Operating Segments [Member] | Mortgage Banking [Member] |  |  |
Interest Expense: |  |  |
Consolidated interest expense | 545 | 546 | 875
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 669 | 397 | 295
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 2,933 | 1,169 | 1,049
Reconciling Items Sub-Total [Member] |  |  |
Interest Income: |  |  |
Other unallocated interest income | 2,319 | 1,388 | 3,202
Reconciling Items Sub-Total [Member] | Senior Notes And Other Interest [Member] |  |  |
Interest Expense: |  |  |
Corporate capital allocation | 21,742 | 6,796 | 715
Reconciling Items Sub-Total [Member] | Unallocated Corporate Overhead [Member] |  |  |
Depreciation and Amortization: |  |  |
Consolidated depreciation and amortization | 4,166 | 905 | 488
Expenditures for Property and Equipment: |  |  |
Consolidated expenditures for property and equipment | 738 | 2,752 | 207
Reconciling Items Sub-Total [Member] | Corporate Capital Allocation [Member] |  |  |
Interest Expense: |  |  |
Corporate capital allocation | $ (116,457) | $ (91,507) | $ (71,226)

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