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Schedule II - Condensed Financial Information of Registrant - Condensed Balance Sheets (Parenthetical) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2014
Dec. 02, 2014
Dec. 31, 2013
Condensed Financial Information Of Parent Company Only Disclosure [Abstract]      
Contingently redeemable common stock, issued shares 1,000us-gaap_TemporaryEquitySharesIssued 1,000us-gaap_TemporaryEquitySharesIssued 1,000us-gaap_TemporaryEquitySharesIssued
Contingently redeemable common stock, outstanding shares 1,000us-gaap_TemporaryEquitySharesOutstanding   1,000us-gaap_TemporaryEquitySharesOutstanding
Cumulative convertible preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Cumulative convertible preferred stock, shares authorized 1,000us-gaap_PreferredStockSharesAuthorized   1,000us-gaap_PreferredStockSharesAuthorized
Cumulative convertible preferred stock, shares issued 12us-gaap_PreferredStockSharesIssued   30us-gaap_PreferredStockSharesIssued
Cumulative convertible preferred stock, shares outstanding 12us-gaap_PreferredStockSharesOutstanding   30us-gaap_PreferredStockSharesOutstanding
Cumulative convertible preferred stock, minimum liquidation preference $ 8.49us-gaap_PreferredStockLiquidationPreference   $ 6.98us-gaap_PreferredStockLiquidationPreference
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare   $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 55,000us-gaap_CommonStockSharesAuthorized   55,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 43,769us-gaap_CommonStockSharesIssued   43,641us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 34,102us-gaap_CommonStockSharesOutstanding   35,366us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 9,667us-gaap_TreasuryStockShares   8,275us-gaap_TreasuryStockShares