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Subsequent Event - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			0 Months Ended				0 Months Ended
	Mar. 31, 2014 7 7/8% Senior Subordinated Notes [Member]	Apr. 22, 2010 7 7/8% Senior Subordinated Notes [Member]	Apr. 18, 2014 Subsequent Event [Member]	Apr. 18, 2014 Subsequent Event [Member] LIBO Rate [Member]	Apr. 18, 2014 Subsequent Event [Member] Base Rate [Member]	Apr. 18, 2014 Subsequent Event [Member] 7 7/8% Senior Subordinated Notes [Member]	Apr. 18, 2014 Subsequent Event [Member] Debt Ratio Less Than Or Equal To Three [Member] LIBO Rate [Member]	Apr. 18, 2014 Subsequent Event [Member] Debt Ratio Less Than Or Equal To Three [Member] Base Rate [Member]	Apr. 18, 2014 Subsequent Event [Member] Term A Loan Facility [Member]	Apr. 18, 2014 Subsequent Event [Member] Incremental Facility [Member]
Subsequent Event [Line Items]
Amended and restated date			Apr. 18, 2014
Increase in credit Facility									$ 300,000	$ 500,000
Interest rate on convertible notes	7.875%	7.875%	7.875%
Aggregate principal amount of debt issued		$ 400,000				$ 400,000
Term A Loan Adjusted Base Rate				2.00%	1.00%		1.75%	0.75%
Ratio of indebtedness to net capital minimum				1	1
Ratio of indebtedness to net capital one				3.00	3.00

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Line Of Credit Facility Amended And Restated Date

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- Definition

Ratio of indebtedness to net capital minimum.

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Ratio of indebtedness to net capital one.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



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-Name Accounting Standards Codification

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-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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-Subparagraph (SX 210.5-02.19(b),22(b))

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-Number 210

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