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Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Debt Instrument [Line Items] |  |
Long-term debt maturities repayment of principal in next twelve months | $ 8,196,000 |
Long-term debt maturities repayment of principal in year two | 12,139,000 |
Long-term debt maturities repayment of principal in year three | 9,141,000 |
Long-term debt maturities repayment of principal in year four | 9,136,000 |
Long-term debt maturities repayment of principal in year five | 12,037,000 |
Long-term debt maturities repayment of principal in year five thereafter | 59,510,000 |
Total long-term debt | 110,103,000 | 118,481,000
Principal payments | 2,900,000 |
Unsecured senior notes issue | 7,000,000 |
Conversion price of debt instrument | $ 17.01 |
Carrying amount of convertible debt instrument | 187,000 | 181,000
Maximum debenture redeemable for cash | 200,000 |
Total debentures redeemed for cash | 5,000 | 2,000
Percentage of equity of total capitalization | 40.00% |
Fixed charge coverage ratio | 1.2 |
Percentage of additional debt covenant required to maintain | 20.00% |
Maximum limit on payment of dividends | 2.5 |
Cumulative consolidated net income base | 85,100,000 |
Cumulative net income with restrictions | 37,600,000 |
Cumulative net income free of restrictions | 47,500,000 |
Restricted net assets of consolidated subsidiaries | 54,200,000 |
Percentage of restricted net assets | 21.00% |
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 5.28% |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 6.43% |
9.57% bond, due May 1, 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 9.57% |
Annual sinking fund payment | 909,000 |
Total long-term debt | 5,444,000 | 6,348,000
Debt instrument, maturity date | May 01, 2018 |
10.03% bond, due May 1, 2018 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 10.03% |
Annual sinking fund payment | 500,000 |
Total long-term debt | 2,994,000 | 3,492,000
Debt instrument, maturity date | May 01, 2018 |
5.68% note, due June 30, 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 5.68% |
Total long-term debt | 29,000,000 | 29,000,000
Debt instrument, maturity date | Jun. 30, 2026 |
7.83% note, due January 1, 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 7.83% |
Total long-term debt | 4,000,000 | 6,000,000
Debt instrument, maturity date | Jan. 01, 2015 |
Maximum limit on payment of dividends | 10.0 |
Cumulative consolidated net income base | 185,300,000 |
Cumulative net income with restrictions | 103,000,000 |
Cumulative net income free of restrictions | $ 82,300,000 |
First mortgage bond one [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 6.85% |
First mortgage bond two [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, interest percentage | 4.90% |

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