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Investments in Marketable Securities and Unconsolidated Entities - Narrative (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2014
Schedule of Equity Method Investments [Line Items] |  |  |
Available-for-sale Securities | $ 26,000,000 us-gaap_AvailableForSaleSecurities |  |
Unrealized gain related to available-for-sale securities | 206,000 us-gaap_MarketableSecuritiesUnrealizedGainLoss | 0 us-gaap_MarketableSecuritiesUnrealizedGainLoss |
Inspirada |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Settlement of unconsolidated entity debt obligation |  |  | (1,000,000)bzh_SettlementOfUnconsolidatedJvDebtObligation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bzh_InspiradaMember
Joint Venture Obligation | 5,700,000 bzh_JointVentureObligation / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = bzh_InspiradaMember |  |
Financial Guarantee |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Guarantor Obligations, Current Carrying Value | $ 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember |  | $ 0 us-gaap_GuaranteeObligationsCurrentCarryingValue / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_FinancialGuaranteeMember

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- Definition Joint Venture Obligation + References No definition available. + Details
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- Definition Settlement of unconsolidated JV debt obligation + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27405-111563 + Details
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