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LONG TERM DEBT - Additional Information (Detail) |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 06, 2015 USD ($) | May. 21, 2014 USD ($) $ / shares shares | Dec. 07, 2012 USD ($) | Apr. 23, 2012 USD ($) $ / note | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Dec. 06, 2012 USD ($) $ / note
Debt Instrument [Line Items] |  |  |  |  |  |  |
Net proceeds from issuance of long term debt |  |  |  |  | $ 172,304,000 | $ 0 |
Proceeds from issuance of tangible equity units, net of issuance costs |  |  |  |  | $ 0 | $ 65,642,000 |
Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Minimum redemption period notice required |  |  |  |  | 30 days |  |
Maximum redemption period notice required |  |  |  |  | 60 days |  |
Redemption price, percentage |  |  |  |  | 100.00% |  |
Senior Notes | 7.50% Senior Notes Due April 15, 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount issued |  |  |  | $ 33,000,000.0 |  |  | $ 45,000,000.0
Stated interest rate |  |  |  | 7.50% | 7.50% |  |
Sale price of notes to public | $ / note |  |  |  | 25.00 |  |  | 25.00
Net proceeds from issuance of long term debt |  |  | $ 50,100,000 | $ 31,700,000 |  |  |
Exercise of underwriters' overallotment option |  |  | $ 6,800,000 |  |  |  |
Senior Notes | 5.25% Senior Notes Due April 15, 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Aggregate principal amount issued | $ 175,000,000 |  |  |  |  |  |
Stated interest rate | 5.25% |  |  |  |  |  |
Net proceeds from issuance of long term debt | $ 172,800,000 |  |  |  |  |  |
Junior Subordinated Debt | 7.50% Amortizing Note Due May 15, 2017 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 7.50% |  |  |  |  |
Gross proceeds from issuance of tangible equity units |  | $ 69,000,000 |  |  |  |  |
Tangible equity units dividend rate |  | 8.00% |  |  |  |  |
Tangible equity units issued during period, shares | shares |  | 1,380,000 |  |  |  |  |
Tangible equity units issued to underwriter during period, shares | shares |  | 180,000 |  |  |  |  |
Tangible equity units, price per share | $ / shares |  | $ 50.00 |  |  |  |  |
Tangible equity units, convertible, conversion ratio |  | 10.604556 |  |  |  |  |
Fair value of debt instrument |  | $ 14,600,000 |  |  |  |  |
Adjustments to additional paid in capital, issuance of tangible equity units |  | 54,400,000 |  |  |  |  |
Tangible equity units issued, issuance costs |  | 4,000,000 |  |  |  |  |
Tangible equity units issued, issuance costs, underwriter discount |  | 3,300,000 |  |  |  |  |
Debt instrument, deferred finance cost |  | 857,000 |  |  |  |  |
Adjustments to additional paid in capital, tangible equity units issued, issuance costs |  | 3,200,000 |  |  |  |  |
Proceeds from issuance of tangible equity units, net of issuance costs |  | $ 65,000,000 |  |  |  |  |

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