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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

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

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-Topic 210

-SubTopic 10

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-Number 210

-Section 02

-Paragraph 20, 22

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

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Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

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Long-Term Debt Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Long Term Debt Maturities Repayments Of Principal [Line Items]
Amount of long-term debt maturing - 2014
Amount of long-term debt maturing - 2015
Amount of long-term debt maturing - 2016	300,000
Amount of long-term debt maturing - 2017
Amount of long-term debt maturing - 2018	250,000
Amount of long-term debt maturing - Thereafter	1,050,000
Long-term debt	1,600,000	1,500,000
2010 Senior Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Amount of long-term debt maturing - 2014
Amount of long-term debt maturing - 2015
Amount of long-term debt maturing - 2016
Amount of long-term debt maturing - 2017
Amount of long-term debt maturing - 2018
Amount of long-term debt maturing - Thereafter	500,000
Long-term debt	500,000	500,000
2011 Senior Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Amount of long-term debt maturing - 2014
Amount of long-term debt maturing - 2015
Amount of long-term debt maturing - 2016	300,000
Amount of long-term debt maturing - 2017
Amount of long-term debt maturing - 2018
Amount of long-term debt maturing - Thereafter	300,000
Long-term debt	600,000	600,000
2013 Senior Notes
Long Term Debt Maturities Repayments Of Principal [Line Items]
Amount of long-term debt maturing - 2014
Amount of long-term debt maturing - 2015
Amount of long-term debt maturing - 2016
Amount of long-term debt maturing - 2017
Amount of long-term debt maturing - 2018	250,000
Amount of long-term debt maturing - Thereafter	250,000
Long-term debt	$ 500,000