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Stockholders' Equity - Summary of Special Cash Dividends (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
$1.00 Special Cash Dividend Per Share [Member]
Dividends Payable [Line Items]
Special Cash Dividend Per Share	$ 1.00
Declaration Date	Jun. 20, 2012
Holders of Record Date	Jul. 02, 2012
Payment Date	Jul. 16, 2012
Total Dividend	$ 13,804
$2.50 Special Cash Dividend Per Share [Member]
Dividends Payable [Line Items]
Special Cash Dividend Per Share	$ 2.50
Declaration Date	Nov. 14, 2012
Holders of Record Date	Nov. 27, 2012
Payment Date	Dec. 11, 2012
Total Dividend	34,551
$0.50 Special Cash Dividend Per Share [Member]
Dividends Payable [Line Items]
Special Cash Dividend Per Share	$ 0.50
Declaration Date	Dec. 11, 2012
Holders of Record Date	Dec. 21, 2012
Payment Date	Dec. 28, 2012
Total Dividend	6,910
$8.50 Special Cash Dividend Per Share [Member]
Dividends Payable [Line Items]
Special Cash Dividend Per Share	$ 8.50
Declaration Date	Aug. 07, 2013
Holders of Record Date	Aug. 20, 2013
Payment Date	Aug. 27, 2013
Total Dividend	$ 119,788

X

- Definition

Date the declared dividend will be paid, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

+ Details

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X

- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph a

-Article 7



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

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

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X

- Definition

Date the dividend to be paid was declared, in CCYY-MM-DD format.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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X

- Definition

Date the holder must own the stock to be entitled to the dividend, in CCYY-MM-DD format.

+ References

No definition available.

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