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Stock-Based Compensation (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 03, 2012	Feb. 08, 2012	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	May 25, 2012	May 22, 2009	May 27, 2007	May 26, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			23,466,000		23,466,000		23,466,000	13,716,000	5,231,250	4,050,000
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period			32,072	72,440	462,846	979,436
Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable During Period Weighted Average Exercise Price (in Dollars per share)			$ 25.69	$ 16.90	$ 21.48	$ 12.58
Share Based Compensation Arrangement By Share-Based Payment Award Equity Options Nonvested Number			1,123,000		1,123,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 8,312,061		$ 8,312,061
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition			2 years 9 months 26 days
Employee Service Share Based Compensation Nonvested Restricted Stock Awards Total Compensation Cost Not Yet Recognized			$ 80,892		$ 80,892
Employee Service Share Based Compensation Nonvested Restricted Awards Total Compensation Cost Not Yet Recognized Period For Recognition			8 years 1 month
Related Party Transaction Restricted Shares Granted During The Period	1,893,342	1,463,057
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share Price	$ 21.13	$ 27.34

X

- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for restricted stock compensation plans, using a decimal to express in number of years.

+ References

No definition available.

+ Details

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X

- Definition

As of the balance sheet date, the aggregate unrecognized cost of restricted stock awards made to employees under equity-based compensation awards that have yet to vest.

+ References

No definition available.

+ Details

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X

- Definition

Gross number of share units granted during the period to an officer of the company.

+ References

No definition available.

+ Details

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X

- Definition

The number of non-vested equity-based payment instruments, including stock (or unit) options, that validly exist and are outstanding as of the balance sheet date

+ References

No definition available.

+ Details

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X

- Definition

The weighted-average price as of balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan that vested during the reporting period.

+ References

No definition available.

+ Details

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X

- Definition

Number of options for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

No definition available.

+ Details

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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X

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258

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