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Employee Compensation Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Jul. 31, 2013	Jun. 30, 2013
Final Payments Under Existing Cash Bonus Program
Employee Compensation Plans
Accrued bonuses		$ 10.9
Management Annual Incentive Plan | Minimum
Employee Compensation Plans
Incentive plan payout percentages of target values		0.00%
Management Annual Incentive Plan | Maximum
Employee Compensation Plans
Incentive plan payout percentages of target values		200.00%
Management Annual Incentive Plan | Percentage accrued
Employee Compensation Plans
Incentive plan payout percentages of target values		100.00%
Annual Incentive Plan
Employee Compensation Plans
Accrued bonuses		11.0
Long Term Incentive Plan
Employee Compensation Plans
Incentive plan, number of performance units granted in period	31,100
Incentive plan payout, performance below minimum target threshold		$ 0
Long Term Incentive Plan | Minimum
Employee Compensation Plans
Incentive plan payout percentages of target values	50.00%
Long Term Incentive Plan | Maximum
Employee Compensation Plans
Incentive plan payout percentages of target values	200.00%

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- Definition

Incentive plan payout percentages of target values based on performance above a minimum threshold

+ References

No definition available.

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- Definition

Incentive plan payout if actual performance is below established minimum target thresholds

+ References

No definition available.

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.15(a))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

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- Definition

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).

+ 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 (c)(2)(iii)(1)

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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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