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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Significant Accounting Policies [Line Items] |  |  |  |
Cash | $ 667,863,000 | $ 396,619,000 | $ 425,316,000 | $ 545,419,000
Contract land deposit impairments (recoveries), net | (1,238,000) | 4,269,000 | 11,058,000 |
Contract land deposit assets impairment valuation allowances | 29,999,000 | 31,306,000 |  |
Excess tax benefits from equity-based compensation | $ 58,681,000 | 0 | 0 |
Adjustment to additional paid in capital, income tax effect from share-based compensation, net |  | 13,661,000 | 23,311,000 |
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax |  | 609,000 |  |
Retained Earnings |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax |  | (957,000) |  |
Accounting Standards Update 2016-09 |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating activities |  | 13,661,000 | 23,311,000 |
Financing activities |  | 13,661,000 | $ 23,311,000 |
Accounting Standards Update 2016-09 | Retained Earnings |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax |  | (957,000) |  |
Model home furniture and fixtures |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |  |
Office facilities and other | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |  |
Office facilities and other | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 10 years |  |  |
Manufacturing Facilities | Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |  |
Manufacturing Facilities | Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, Plant and Equipment, Useful Life | 40 years |  |  |
Homebuilding: |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash | $ 645,087,000 | 375,748,000 |  |
Impairment of goodwill | 0 |  |  |
Homebuilding: | Heartland Homes Inc |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangibles acquired from business acquisition, net of accumulated amortization | $ 776,000 | 2,158,000 |  |
Weighted average life of finite-lived intangible assets | 5 years |  |  |
Goodwill acquired from business acquisition | $ 441,000 | 441,000 |  |
Mortgage Banking: |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash | $ 21,707,000 | 19,657,000 |  |
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Typical length of days loans sold into secondary market | 30 days |  |  |
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Rate lock commitments |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Notional or Principal Amount | $ 490,184,000 |  |  |
Mortgage Banking: | Level 2 | Fair Value, Measurements, Recurring | Forward sales contracts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Notional or Principal Amount | 705,405,000 |  |  |
Consolidated Joint Venture |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Cash | $ 1,069,000 | $ 1,214,000 |  |

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