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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)