Debt	3 Months Ended
Mar. 31, 2013
Debt Disclosure [Abstract]
Debt Disclosure [Text Block]	Debt Notes Payable - Homebuilding At March 31, 2013, borrowing availability under the Credit Facility was $62.2 million in accordance with the borrowing base calculation, and there were no borrowings outstanding and $15.9 million of letters of credit outstanding under the Credit Facility, leaving net remaining borrowing availability of $46.3 million. At March 31, 2013, the Company had pledged $154.9 million in aggregate book value of inventory to secure any borrowings and letters of credit outstanding under the Credit Facility. At March 31, 2013, the Company was in compliance with all financial covenants of the Credit Facility. At March 31, 2013, the Company is party to three secured credit agreements for the issuance of letters of credit outside of the Credit Facility (collectively, the “Letter of Credit Facilities”). At March 31, 2013, there was $9.0 million of outstanding letters of credit in aggregate under the Company's three Letter of Credit Facilities, which were collateralized with $9.1 million of the Company's cash. Notes Payable — Financial Services In March 2013, M/I Financial amended and restated the MIF Mortgage Warehousing Agreement, which, among other things, increased the maximum borrowing availability from $70.0 million to $80.0 million and provided for an optional increase of the maximum borrowing availability of up to an additional $20.0 million (subject to certain conditions), extended the expiration date to March 28, 2014, and increased the maximum principal amount permitted to be outstanding at any one time in aggregate under all warehouse credit lines from $100.0 million to $125.0 million. The interest rate was also adjusted to a per annum rate equal to the greater of (1) the floating LIBOR rate plus 275 basis points and (2) 3.50%. The rate had previously been a per annum rate equal to the greater of (1) the floating LIBOR rate plus 225 basis points and (2) 3.50%. On November 13, 2012, we entered into the MIF Mortgage Repurchase Facility with a maximum borrowing availability of $15.0 million. At March 31, 2013, our total combined maximum borrowing availability under the two credit facilities is $95.0 million. At March 31, 2013, M/I Financial had $53.1 million outstanding on a combined basis under its credit facilities and was in compliance with all financial covenants of those agreements. Convertible Senior Subordinated Notes In March 2013, the Company issued $86.3 million aggregate principal amount of 2018 Convertible Senior Subordinated Notes. The 2018 Convertible Senior Subordinated Notes bear interest at a rate of 3.0% per year, payable semiannually in arrears on March 1 and September 1 of each year beginning on September 1, 2013. The 2018 Convertible Senior Subordinated Notes mature on March 1, 2018. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2018 Convertible Senior Subordinated Notes into the Company's common shares. The conversion rate initially equals 30.9478 shares per $1,000 of principal amount. This corresponds to an initial conversion price of approximately $32.31 per common share, which equates to approximately 2.7 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2018 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed on a senior subordinated unsecured basis by those subsidiaries of the Company that are guarantors under the Company's 2018 Senior Notes and 2017 Convertible Senior Subordinated Notes. The 2018 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the subsidiary guarantors and are subordinated in right of payment to our existing and future senior indebtedness and are also effectively subordinated to our existing and future secured indebtedness. The indenture governing the 2018 Convertible Senior Subordinated Notes provides that the Company may not redeem the 2018 Convertible Senior Subordinated Notes prior to March 6, 2016, but also contains provisions requiring the Company to repurchase the notes (subject to certain exceptions), at a holder's option, upon the occurrence of a fundamental change (as defined in the indenture). On or after March 6, 2016, the Company may redeem for cash any or all of the 2018 Convertible Senior Subordinated Notes (except for any 2018 Convertible Senior Subordinated Notes that the Company is required to repurchase in connection with a fundamental change), but only if the last reported sale price of the Company's common shares exceeds 130% of the applicable conversion price for the notes on each of at least 20 applicable trading days. The 20 trading days do not need to be consecutive, but must occur during a period of 30 consecutive trading days that ends within 10 trading days immediately prior to the date the Company provides the notice of redemption. The redemption price for the 2018 Convertible Senior Subordinated Notes to be redeemed will equal 100% of the principal amount, plus accrued and unpaid interest, if any. In September 2012, the Company issued $57.5 million aggregate principal amount of 2017 Convertible Senior Subordinated Notes. The 2017 Convertible Senior Subordinated Notes bear interest at a rate of 3.25% per year, payable semiannually in arrears on March 15 and September 15 of each year beginning on March 15, 2013. The 2017 Convertible Senior Subordinated Notes mature on September 15, 2017. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2017 Convertible Senior Subordinated Notes into the Company's common shares. The conversion rate initially equals 42.0159 shares per $1,000 of their principal amount. This corresponds to an initial conversion price of approximately $23.80 per common share, which equates to approximately 2.4 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2017 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed on a senior subordinated unsecured basis by those subsidiaries of the Company that are guarantors under the Company's 2018 Senior Notes and 2018 Convertible Senior Subordinated Notes. The 2017 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the subsidiary guarantors and are subordinated in right of payment to our existing and future senior indebtedness and are also effectively subordinated to our existing and future secured indebtedness. The indenture governing the 2017 Convertible Senior Subordinated Notes provides that we may not redeem the notes prior to their stated maturity date, but also contains provisions requiring the Company to repurchase the 2017 Convertible Senior Subordinated Notes (subject to certain exceptions), at a holder's option, upon the occurrence of a fundamental change (as defined in the indenture). Senior Notes As of March 31, 2013, we had $230.0 million of our 2018 Senior Notes outstanding. The 2018 Senior Notes bear interest at a rate of 8.625% per year, payable semiannually in arrears on May 15 and November 15 of each year, and mature on November 15, 2018. The 2018 Senior Notes are general, unsecured senior obligations of the Company and the subsidiary guarantors and rank equally in right of payment with all our existing and future unsecured senior indebtedness. The 2018 Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by all of our subsidiaries, with the exception of subsidiaries that are primarily engaged in the business of mortgage financing, the origination of mortgages for resale, title insurance or similar financial businesses relating to the homebuilding and home sales business and certain subsidiaries that are not 100%-owned by the Company or another subsidiary, and certain subsidiaries that are otherwise designated by the Company as Unrestricted Subsidiaries in accordance with the terms of the indenture. The indenture governing our 2018 Senior Notes limits our ability to pay dividends on, and repurchase, our common shares and our 9.75% Series A Preferred Shares (the “Series A Preferred Shares”) to the amount of the positive balance in our “restricted payments basket,” as defined in the indenture. The restricted payments basket was $95.7 million at March 31, 2013. We are permitted to pay dividends on, and repurchase, our common shares and Series A Preferred Shares to the extent of the positive balance in our restricted payments basket. On March 11, 2013, we announced our intention to redeem 2,000 of our outstanding Series A Preferred Shares. Such shares were redeemed on April 10, 2013 for $50.4 million of cash, which will reduce the restricted payments basket with respect to our 2018 Senior Notes by that amount. In addition, although not yet declared, our board of directors has determined that we will pay the quarterly dividend on our Series A Preferred Shares for the second quarter of 2013 (with such dividend being payable on June 17, 2013 to holders of record on June 1, 2013). The determination to pay future dividends on, or make future repurchases of, our common shares or Series A Preferred Shares will be at the discretion of our board of directors and will depend upon our results of operations, financial condition, capital requirements and compliance with debt covenants and the terms of our Series A Preferred Shares, and other factors deemed relevant by our board of directors.

Debt

Notes Payable - Homebuilding

At March 31, 2013, borrowing availability under the Credit Facility was $62.2 million in accordance with the borrowing base calculation, and there were no borrowings outstanding and $15.9 million of letters of credit outstanding under the Credit Facility, leaving net remaining borrowing availability of $46.3 million. At March 31, 2013, the Company had pledged $154.9 million in aggregate book value of inventory to secure any borrowings and letters of credit outstanding under the Credit Facility. At March 31, 2013, the Company was in compliance with all financial covenants of the Credit Facility.

At March 31, 2013, the Company is party to three secured credit agreements for the issuance of letters of credit outside of the Credit Facility (collectively, the “Letter of Credit Facilities”).

At March 31, 2013, there was $9.0 million of outstanding letters of credit in aggregate under the Company's three Letter of Credit Facilities, which were collateralized with $9.1 million of the Company's cash.

Notes Payable — Financial Services

In March 2013, M/I Financial amended and restated the MIF Mortgage Warehousing Agreement, which, among other things, increased the maximum borrowing availability from $70.0 million to $80.0 million and provided for an optional increase of the maximum borrowing availability of up to an additional $20.0 million (subject to certain conditions), extended the expiration date to March 28, 2014, and increased the maximum principal amount permitted to be outstanding at any one time in aggregate under all warehouse credit lines from $100.0 million to $125.0 million. The interest rate was also adjusted to a per annum rate equal to the greater of (1) the floating LIBOR rate plus 275 basis points and (2) 3.50%. The rate had previously been a per annum rate equal to the greater of (1) the floating LIBOR rate plus 225 basis points and (2) 3.50%.

On November 13, 2012, we entered into the MIF Mortgage Repurchase Facility with a maximum borrowing availability of $15.0 million. At March 31, 2013, our total combined maximum borrowing availability under the two credit facilities is $95.0 million.

At March 31, 2013, M/I Financial had $53.1 million outstanding on a combined basis under its credit facilities and was in compliance with all financial covenants of those agreements.

Convertible Senior Subordinated Notes

In March 2013, the Company issued $86.3 million aggregate principal amount of 2018 Convertible Senior Subordinated Notes. The 2018 Convertible Senior Subordinated Notes bear interest at a rate of 3.0% per year, payable semiannually in arrears on March 1 and September 1 of each year beginning on September 1, 2013. The 2018 Convertible Senior Subordinated Notes mature on March 1, 2018. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2018 Convertible Senior Subordinated Notes into the Company's common shares. The conversion rate initially equals 30.9478 shares per $1,000 of principal amount. This corresponds to an initial conversion price of approximately $32.31 per common share, which equates to approximately 2.7 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2018 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed on a senior subordinated unsecured basis by those subsidiaries of the Company that are guarantors under the Company's 2018 Senior Notes and 2017 Convertible Senior Subordinated Notes. The 2018 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the subsidiary guarantors and are subordinated in right of payment to our existing and future senior indebtedness and are also effectively subordinated to our existing and future secured indebtedness. The indenture governing the 2018 Convertible Senior Subordinated Notes provides that the Company may not redeem the 2018 Convertible Senior Subordinated Notes prior to March 6, 2016, but also contains provisions requiring the Company to repurchase the notes (subject to certain exceptions), at a holder's option, upon the occurrence of a fundamental change (as defined in the indenture).

On or after March 6, 2016, the Company may redeem for cash any or all of the 2018 Convertible Senior Subordinated Notes (except for any 2018 Convertible Senior Subordinated Notes that the Company is required to repurchase in connection with a fundamental change), but only if the last reported sale price of the Company's common shares exceeds 130% of the applicable conversion price for the notes on each of at least 20 applicable trading days. The 20 trading days do not need to be consecutive, but must occur during a period of 30 consecutive trading days that ends within 10 trading days immediately prior to the date the Company provides the notice of redemption. The redemption price for the 2018 Convertible Senior Subordinated Notes to be redeemed will equal 100% of the principal amount, plus accrued and unpaid interest, if any.

In September 2012, the Company issued $57.5 million aggregate principal amount of 2017 Convertible Senior Subordinated Notes. The 2017 Convertible Senior Subordinated Notes bear interest at a rate of 3.25% per year, payable semiannually in arrears on March 15 and September 15 of each year beginning on March 15, 2013. The 2017 Convertible Senior Subordinated Notes mature on September 15, 2017. At any time prior to the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their 2017 Convertible Senior Subordinated Notes into the Company's common shares. The conversion rate initially equals 42.0159 shares per $1,000 of their principal amount. This corresponds to an initial conversion price of approximately $23.80 per common share, which equates to approximately 2.4 million common shares. The conversion rate is subject to adjustment upon the occurrence of certain events. The 2017 Convertible Senior Subordinated Notes are fully and unconditionally guaranteed on a senior subordinated unsecured basis by those subsidiaries of the Company that are guarantors under the Company's 2018 Senior Notes and 2018 Convertible Senior Subordinated Notes. The 2017 Convertible Senior Subordinated Notes are senior subordinated unsecured obligations of the Company and the subsidiary guarantors and are subordinated in right of payment to our existing and future senior indebtedness and are also effectively subordinated to our existing and future secured indebtedness. The indenture governing the 2017 Convertible Senior Subordinated Notes provides that we may not redeem the notes prior to their stated maturity date, but also contains provisions requiring the Company to repurchase the 2017 Convertible Senior Subordinated Notes (subject to certain exceptions), at a holder's option, upon the occurrence of a fundamental change (as defined in the indenture).

Senior Notes

As of March 31, 2013, we had $230.0 million of our 2018 Senior Notes outstanding. The 2018 Senior Notes bear interest at a rate of 8.625% per year, payable semiannually in arrears on May 15 and November 15 of each year, and mature on November 15, 2018. The 2018 Senior Notes are general, unsecured senior obligations of the Company and the subsidiary guarantors and rank equally in right of payment with all our existing and future unsecured senior indebtedness. The 2018 Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by all of our subsidiaries, with the exception of subsidiaries that are primarily engaged in the business of mortgage financing, the origination of mortgages for resale, title insurance or similar financial businesses relating to the homebuilding and home sales business and certain subsidiaries that are not 100%-owned by the Company or another subsidiary, and certain subsidiaries that are otherwise designated by the Company as Unrestricted Subsidiaries in accordance with the terms of the indenture.

The indenture governing our 2018 Senior Notes limits our ability to pay dividends on, and repurchase, our common shares and our 9.75% Series A Preferred Shares (the “Series A Preferred Shares”) to the amount of the positive balance in our “restricted payments basket,” as defined in the indenture. The restricted payments basket was $95.7 million at March 31, 2013. We are permitted to pay dividends on, and repurchase, our common shares and Series A Preferred Shares to the extent of the positive balance in our restricted payments basket.

On March 11, 2013, we announced our intention to redeem 2,000 of our outstanding Series A Preferred Shares. Such shares were redeemed on April 10, 2013 for $50.4 million of cash, which will reduce the restricted payments basket with respect to our 2018 Senior Notes by that amount. In addition, although not yet declared, our board of directors has determined that we will pay the quarterly dividend on our Series A Preferred Shares for the second quarter of 2013 (with such dividend being payable on June 17, 2013 to holders of record on June 1, 2013). The determination to pay future dividends on, or make future repurchases of, our common shares or Series A Preferred Shares will be at the discretion of our board of directors and will depend upon our results of operations, financial condition, capital requirements and compliance with debt covenants and the terms of our Series A Preferred Shares, and other factors deemed relevant by our board of directors.