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Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | |||||||||||||||||||||
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Jan. 31, 2012
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Jun. 30, 2012
Derivative
Entity
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Jun. 30, 2011
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Jun. 30, 2012
Derivative
Entity
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Jun. 30, 2011
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Dec. 31, 2011
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Feb. 28, 2011
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Jun. 30, 2012
After tenth anniversary in 2015
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Jun. 30, 2012
After fifth anniversary in 2011
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Aug. 31, 2011
800 Superior LLC
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Jun. 30, 2012
ACP Re, Ltd
800 Superior LLC
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Jun. 30, 2012
ACP Re, Ltd
800 Superior LLC
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Jun. 30, 2012
Revolving credit facility
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Jun. 30, 2011
Revolving credit facility
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Jun. 30, 2012
Revolving credit facility
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Jun. 30, 2011
Revolving credit facility
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Jan. 28, 2011
Revolving credit facility
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Jun. 30, 2012
Revolving credit facility
Federal Funds Rate
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Jun. 30, 2012
Revolving credit facility
One Month LIBOR
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Jun. 30, 2012
Revolving credit facility
Maximum
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Jan. 28, 2011
Revolving credit facility
Maximum
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Jun. 30, 2012
Revolving credit facility
Minimum
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Jun. 30, 2012
Letter of Credit
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Jan. 28, 2011
Letter of Credit
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Jun. 30, 2012
Comerica Letter of Credit Facility
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Feb. 28, 2011
Secured loan
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Jun. 30, 2012
Secured loan
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Jun. 30, 2011
Secured loan
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Jun. 30, 2012
Secured loan
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Jun. 30, 2011
Secured loan
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Jun. 01, 2008
Promissory note
Installment
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Jun. 30, 2012
Promissory note
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Jun. 30, 2011
Promissory note
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Jun. 30, 2012
Promissory note
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Jun. 30, 2011
Promissory note
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Jun. 30, 2012
Promissory note
800 Superior LLC
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Jun. 30, 2012
Promissory note
ACP Re, Ltd
800 Superior LLC
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Jun. 30, 2012
Promissory note
ACP Re, Ltd
800 Superior LLC
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Credit agreement, expiration duration | 3 years | |||||||||||||||||||||||||||||||||||||
| Line of credit, maximum borrowing capacity | $ 150,000,000 | $ 50,000,000 | $ 75,000,000 | |||||||||||||||||||||||||||||||||||
| Line of credit, expansion limit | 50,000,000 | |||||||||||||||||||||||||||||||||||||
| Line of credit, Covenant Compliance | The Company was in compliance with all covenants as of June 30, 2012. | |||||||||||||||||||||||||||||||||||||
| Letters of credit, outstanding amount | 48,895,000 | 48,895,000 | 49,801,000 | |||||||||||||||||||||||||||||||||||
| Credit agreement, remaining borrowing capacity | 101,105,000 | 101,105,000 | 1,105,000 | |||||||||||||||||||||||||||||||||||
| Debt instrument, marginal interest rate | 0.50% | 1.00% | ||||||||||||||||||||||||||||||||||||
| Credit facility, Interest rate | 2.50% | 2.50% | 2.50% | 2.50% | ||||||||||||||||||||||||||||||||||
| Interest expense | 508,000 | 1,023,000 | 1,018,000 | 1,418,000 | 109,000 | 119,000 | 221,000 | 170,000 | ||||||||||||||||||||||||||||||
| Participation fee percentage | 2.25% | 0.40% | ||||||||||||||||||||||||||||||||||||
| Fronting fee percentage | 0.125% | |||||||||||||||||||||||||||||||||||||
| Commitment fee percentage | 0.40% | 0.45% | 0.35% | |||||||||||||||||||||||||||||||||||
| Number of special purpose trusts established | 4 | 4 | ||||||||||||||||||||||||||||||||||||
| Trust equity investment | 3,714,000 | 3,714,000 | ||||||||||||||||||||||||||||||||||||
| Placement fees in connection with common securities issuance | 2,605,000 | |||||||||||||||||||||||||||||||||||||
| Placement fees, amortization period | 30 years | |||||||||||||||||||||||||||||||||||||
| Interest expense related to trust preferred securities | 2,035,000 | 2,552,000 | 4,226,000 | 5,104,000 | ||||||||||||||||||||||||||||||||||
| Number of interest swap agreements related to junior subordinated debentures | 2 | 2 | ||||||||||||||||||||||||||||||||||||
| Interest rate swap agreements, maturity period | 5 years | 5 years | ||||||||||||||||||||||||||||||||||||
| Aggregate principal amount of convertible senior notes issued | 200,000,000 | 200,000,000 | 175,000,000 | |||||||||||||||||||||||||||||||||||
| Issuance of additional convertible senior notes | 25,000,000 | |||||||||||||||||||||||||||||||||||||
| Debt instrument, stated interest rate | 5.50% | 5.50% | 2.00% | 2.00% | 4.45% | 2.00% | 2.00% | |||||||||||||||||||||||||||||||
| Convertible senior notes maturity year | 2021 | 2041 | 2021 | 2041 | ||||||||||||||||||||||||||||||||||
| Convertible senior notes interest payable month and day | --06-15 | --12-15 | ||||||||||||||||||||||||||||||||||||
| Debt Instrument, frequency of periodic payment | Semiannually | |||||||||||||||||||||||||||||||||||||
| Date of first required payment of interest on convertible senior notes | Jun. 15, 2012 | |||||||||||||||||||||||||||||||||||||
| Convertible Senior Notes maturity date | Dec. 15, 2021 | |||||||||||||||||||||||||||||||||||||
| Common stock, par value | $ 0.01 | $ 0.01 | $ 0.01 | |||||||||||||||||||||||||||||||||||
| Debt Conversion earlier date | Sep. 15, 2021 | |||||||||||||||||||||||||||||||||||||
| Conversion rate for conversion of convertible senior notes | 31.4326 | |||||||||||||||||||||||||||||||||||||
| Principal amount per note used in conversion rate | 1,000 | |||||||||||||||||||||||||||||||||||||
| Initial conversion price of per share of Common Stock | $ 31.81 | $ 31.81 | ||||||||||||||||||||||||||||||||||||
| Notes repurchase price, percentage | 100.00% | 100.00% | ||||||||||||||||||||||||||||||||||||
| Unamortized OID | 41,679,000 | 41,679,000 | ||||||||||||||||||||||||||||||||||||
| Deferred origination costs relating to the liability component | 4,750,000 | 4,750,000 | ||||||||||||||||||||||||||||||||||||
| Convertible senior notes effective interest rate | 8.57% | 8.57% | ||||||||||||||||||||||||||||||||||||
| Transaction costs associated with the equity component | 1,250,000 | |||||||||||||||||||||||||||||||||||||
| Interest expense | 3,329,000 | 3,329,000 | 20,000 | 23,000 | 20,000 | 23,000 | ||||||||||||||||||||||||||||||||
| Term loan, maturity period | 7 years | |||||||||||||||||||||||||||||||||||||
| Debt instrument, face amount | 10,800,000 | 30,000,000 | ||||||||||||||||||||||||||||||||||||
| Monthly installment payment | 117,000 | |||||||||||||||||||||||||||||||||||||
| Debt instrument, maturity date range, start | Mar. 25, 2011 | |||||||||||||||||||||||||||||||||||||
| Debt instrument, maturity date range, End | Feb. 25, 2018 | Jun. 01, 2012 | ||||||||||||||||||||||||||||||||||||
| Balloon payment at maturity date | 3,240,000 | |||||||||||||||||||||||||||||||||||||
| Percentage of outstanding balance of loan in excess of fair value of aircraft | 90.00% | |||||||||||||||||||||||||||||||||||||
| Debt instrument, number of periodic payment | 4 | |||||||||||||||||||||||||||||||||||||
| Annual principal payment | 7,500,000 | |||||||||||||||||||||||||||||||||||||
| Imputed interest | 3,155,000 | |||||||||||||||||||||||||||||||||||||
| Debt instrument, imputed interest rate | 4.50% | |||||||||||||||||||||||||||||||||||||
| Promissory notes | 5,000,000 | 5,000,000 | 7,362,000 | 5,000,000 | 5,000,000 | 26,845,000 | 5,000,000 | 5,000,000 | ||||||||||||||||||||||||||||||
| Amortized discount on notes | 1,515,000 | 298,000 | 55,000 | 135,000 | 138,000 | 298,000 | ||||||||||||||||||||||||||||||||
| Percentage of ownership interests | 50.00% | 50.00% | 50.00% | 50.00% | ||||||||||||||||||||||||||||||||||
| Promissory note maturity date | 2012-10 | 2012-10 | 2012-10 | 2012-10 | ||||||||||||||||||||||||||||||||||
| Existing stand-by letters of credit | $ 7,356,000 | $ 7,356,000 | ||||||||||||||||||||||||||||||||||||