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Stockholders' Equity - Non-vested Awards under 2005 Contingent Stock Plan (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-vested awards, beginning of year	7,909,064	4,997,297
Restricted stock shares awarded	(100,200)	(90,100)	(94,200)
Number of non-vested awards, end of year	6,426,953	7,909,064	4,997,297
2005 Contingent Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year	17.19	24.93	21.46
2005 Contingent Stock Plan [Member] | Cash Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-vested awards, beginning of year	58,050
Restricted stock shares issued for new awards	91,480
Restricted stock shares awarded	(9,850)
Restricted stock shares forfeited	(8,000)
Number of non-vested awards, end of year	131,680
2005 Contingent Stock Plan [Member] | Non-vested Restricted Stock Shares Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-vested awards, beginning of year	1,183,660
Restricted stock shares issued for new awards	703,620
Restricted stock shares awarded	(458,750)
Restricted stock shares forfeited	(41,700)
Number of non-vested awards, end of year	1,386,830
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year	20.45
Restricted stock for new awards, Weighted- Average per Share Market Value on Grant Date during the year	17.27
Restricted stock vested, Weighted- Average per Share Market Value on Grant Date during the year	18.23
Restricted stock forfeited, Weighted- Average per Share Market Value on Grant Date during the year	22.89
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year	20.08
2005 Contingent Stock Plan [Member] | Non-vested Restricted Stock Units Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of non-vested awards, beginning of year	342,000
Restricted stock shares issued for new awards	191,700
Restricted stock shares awarded	(100,700)
Restricted stock shares forfeited	(12,200)
Number of non-vested awards, end of year	420,800
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, beginning of year	21.17
Restricted stock for new awards, Weighted- Average per Share Market Value on Grant Date during the year	16.95
Restricted stock vested, Weighted- Average per Share Market Value on Grant Date during the year	18.08
Restricted stock forfeited, Weighted- Average per Share Market Value on Grant Date during the year	19.98
Number of non-vested restricted stock, Weighted- Average per Share Market Value on Grant Date, Ending of year	20.23

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Share Based Payment Award Equity Instruments Other Than Option Non vested Weighted Average Grant Date Fair Value.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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