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Stock-based Compensation - Stock options and SSARs outstanding (Details) (SSARs / Stock Options, USD $) | Dec. 31, 2014
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SSARs / Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares outstanding at beginning of period (shares) | 650,223 bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingNumber / us-gaap_AwardTypeAxis = bzh_SsarsStockOptionsMember
Exercisable at end of period (shares) | 493,398 bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSsarsAndOptionsExercisableNumber / us-gaap_AwardTypeAxis = bzh_SsarsStockOptionsMember
Vested or expected to vest in the future (shares) | 649,954 bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSsarsAndOptionsVestedAndExpectedToVestOutstandingNumber / us-gaap_AwardTypeAxis = bzh_SsarsStockOptionsMember
Weighted average exercise price of shares outstanding at beginning of period (in US$ per share) | $ 18.12 bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = bzh_SsarsStockOptionsMember
Weighted average exercise price of shares exercisable at end of period (in US$ per share) | $ 18.39 bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSSARsAndOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = bzh_SsarsStockOptionsMember
Weighted average exercise price of shares vested or expected to vest in the future (in US$ per share) | $ 18.12 bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSsarsAndOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = bzh_SsarsStockOptionsMember

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Number + References No definition available. + Details
Name: | bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingNumber
Namespace Prefix: | bzh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Outstanding, Weighted Average Exercise Price + References No definition available. + Details
Name: | bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardOutstandingWeightedAverageExercisePrice
Namespace Prefix: | bzh_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Share Based Compensation Arrangement By Share Based Payment Award, Ssars And Options, Exercisable Number + References No definition available. + Details
Name: | bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSsarsAndOptionsExercisableNumber
Namespace Prefix: | bzh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of SSARs and options outstanding and currently exercisable under the plan. + References No definition available. + Details
Name: | bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSSARsAndOptionsExercisableWeightedAverageExercisePrice
Namespace Prefix: | bzh_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest SSARs and stock options outstanding can be converted under the plan. + References No definition available. + Details
Name: | bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSsarsAndOptionsVestedAndExpectedToVestOutstandingNumber
Namespace Prefix: | bzh_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest. + References No definition available. + Details
Name: | bzh_ShareBasedCompensationArrangementByShareBasedPaymentAwardSsarsAndOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
Namespace Prefix: | bzh_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration