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Equity Structure and Transactions - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | 1 Months Ended | 12 Months Ended | ||||||
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Dec. 31, 2012
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Dec. 31, 2011
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Feb. 26, 2013
Subsequent Event
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Dec. 31, 2012
Common Stock, Regular
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Dec. 31, 2011
Common Stock, Regular
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Dec. 31, 2010
Common Stock, Regular
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Dec. 31, 2012
Common Stock, Special
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Dec. 31, 2011
Common Stock, Special
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Dec. 31, 2010
Common Stock, Special
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| Equity Structure And Transactions [Line Items] | |||||||||
| Preferred stock, shares authorized | 20,000,000 | 2,000,000 | |||||||
| Preferred stock, par value | $ 0.00001 | $ 0.00001 | |||||||
| Paid cash dividends, per share | $ 0.32 | $ 0.16 | $ 0.14 | $ 0.79 | $ 0.63 | $ 0.66 | |||
| Cash dividends | $ 23,798 | $ 11,913 | $ 10,446 | $ 59,034 | $ 46,842 | $ 49,132 | |||
| Dividends declared, per common share | $ 0.08 | ||||||||
| Dividend payable date | Mar. 29, 2013 | ||||||||
| Dividend record date | Mar. 15, 2013 | ||||||||
| X | ||||||||||
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- Definition
Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Aggregate dividends declared during the period for each share of common stock outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Date the declared dividend will be paid, in CCYY-MM-DD format. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Equity impact of cash dividends declared by an entity during the period for all classes of stock (common, preferred, etc.). This element includes paid and unpaid dividends declared during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format. No definition available.
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| X | ||||||||||
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- Definition
Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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