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Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended | |||||||||||||||||||||||
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Jan. 31, 2012
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Sep. 30, 2012
Entity
Derivative
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Sep. 30, 2011
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Sep. 30, 2012
Entity
Derivative
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Sep. 30, 2011
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Dec. 31, 2011
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Jun. 30, 2011
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Feb. 28, 2011
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Sep. 30, 2012
After tenth anniversary in 2015
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Sep. 30, 2012
After fifth anniversary in 2011
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Aug. 31, 2011
800 Superior LLC
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Sep. 30, 2012
Promissory note
State and Local Government of Ohio
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Sep. 30, 2012
Promissory note
State and Local Government of Ohio
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Sep. 30, 2012
Promissory note
State and Local Government of Ohio
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Sep. 30, 2012
ACP Re, Ltd
800 Superior LLC
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Sep. 30, 2012
ACP Re, Ltd
800 Superior LLC
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Sep. 30, 2012
Revolving credit facility
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Sep. 30, 2011
Revolving credit facility
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Sep. 30, 2012
Revolving credit facility
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Sep. 30, 2011
Revolving credit facility
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Aug. 09, 2012
Revolving credit facility
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Jan. 28, 2011
Revolving credit facility
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Sep. 30, 2012
Revolving credit facility
Federal Funds Rate
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Sep. 30, 2012
Revolving credit facility
One Month LIBOR
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Sep. 30, 2012
Revolving credit facility
Maximum
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Aug. 10, 2012
Revolving credit facility
Maximum
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Sep. 30, 2012
Revolving credit facility
Minimum
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Sep. 30, 2012
Letter of Credit
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Aug. 10, 2012
Letter of Credit
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Sep. 30, 2012
Comerica Letter of Credit Facility
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Feb. 28, 2011
Secured loan
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Sep. 30, 2012
Secured loan
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Sep. 30, 2011
Secured loan
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Sep. 30, 2012
Secured loan
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Sep. 30, 2011
Secured loan
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Feb. 27, 2011
Secured loan
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Sep. 30, 2012
Promissory note
800 Superior LLC
State and Local Government of Ohio
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Sep. 30, 2012
Promissory note
ACP Re, Ltd
800 Superior LLC
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Sep. 30, 2012
Promissory note
ACP Re, Ltd
800 Superior LLC
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Aug. 31, 2011
Promissory note
ACP Re, Ltd
800 Superior LLC
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Sep. 30, 2012
800 Superior LLC
State and Local Government of Ohio
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| Debt Instrument [Line Items] | |||||||||||||||||||||||||||||||||||||||||
| Credit agreement, expiration duration | 4 years | ||||||||||||||||||||||||||||||||||||||||
| Line of credit, maximum borrowing capacity | $ 150,000,000 | $ 200,000,000 | $ 100,000,000 | $ 75,000,000 | |||||||||||||||||||||||||||||||||||||
| Credit Agreement Termination Fees | 968,000 | ||||||||||||||||||||||||||||||||||||||||
| Line of credit, expansion limit | 100,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Line of credit, Covenant Compliance | The Company was in compliance with all covenants as of September 30, 2012. | ||||||||||||||||||||||||||||||||||||||||
| Letters of credit, outstanding amount | 49,015,000 | 49,015,000 | 49,801,000 | ||||||||||||||||||||||||||||||||||||||
| Credit agreement, remaining borrowing capacity | 150,985,000 | 150,985,000 | 50,985,000 | ||||||||||||||||||||||||||||||||||||||
| Debt instrument, marginal interest rate | 0.50% | 1.00% | |||||||||||||||||||||||||||||||||||||||
| Credit facility, Interest rate | 2.50% | 2.50% | 2.50% | 2.50% | |||||||||||||||||||||||||||||||||||||
| Interest expense | 450,000 | 595,000 | 1,468,000 | 2,013,000 | 107,000 | 117,000 | 328,000 | 288,000 | |||||||||||||||||||||||||||||||||
| Participation fee percentage | 1.50% | 0.40% | |||||||||||||||||||||||||||||||||||||||
| Fronting fee percentage | 0.125% | ||||||||||||||||||||||||||||||||||||||||
| Commitment fee percentage | 0.25% | 0.30% | 0.20% | ||||||||||||||||||||||||||||||||||||||
| 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 | 2,049,000 | 2,552,000 | 6,275,000 | 7,657,000 | |||||||||||||||||||||||||||||||||||||
| 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 | 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 | 34.5759 | ||||||||||||||||||||||||||||||||||||||||
| Principal amount per note used in conversion rate | 1,000 | ||||||||||||||||||||||||||||||||||||||||
| Initial conversion price of per share of Common Stock | $ 28.92 | $ 28.92 | |||||||||||||||||||||||||||||||||||||||
| 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 | 3,578,000 | 10,451,000 | 20,000 | 43,000 | 20,000 | 43,000 | |||||||||||||||||||||||||||||||||||
| Term loan, maturity period | 7 years | ||||||||||||||||||||||||||||||||||||||||
| Debt instrument, face amount | 10,800,000 | ||||||||||||||||||||||||||||||||||||||||
| Monthly installment payment | 117,000 | ||||||||||||||||||||||||||||||||||||||||
| Debt instrument, maturity date range, start | Mar. 25, 2011 | ||||||||||||||||||||||||||||||||||||||||
| Debt instrument, maturity date range, end | Feb. 25, 2018 | ||||||||||||||||||||||||||||||||||||||||
| Balloon payment at maturity date | 3,240,000 | ||||||||||||||||||||||||||||||||||||||||
| Percentage of outstanding balance of loan in excess of fair value of aircraft | 90.00% | ||||||||||||||||||||||||||||||||||||||||
| Notes Payable | 8,000,000 | 8,000,000 | 7,362,000 | 8,000,000 | 5,000,000 | 5,000,000 | |||||||||||||||||||||||||||||||||||
| Term of loan | 15 years | ||||||||||||||||||||||||||||||||||||||||
| Average rate of interest | 1.70% | ||||||||||||||||||||||||||||||||||||||||
| Interest Expense | 7,218,000 | 3,946,000 | 21,303,000 | 12,034,000 | 12,000 | 12,000 | |||||||||||||||||||||||||||||||||||
| Percentage of ownership interests | 50.00% | 50.00% | 50.00% | 50.00% | |||||||||||||||||||||||||||||||||||||
| Existing stand-by letters of credit | 7,393,000 | 7,393,000 | |||||||||||||||||||||||||||||||||||||||
| Availibility of Letters of Credit | $ 11,000 | $ 11,000 | |||||||||||||||||||||||||||||||||||||||