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Long-Term Debt Senior Notes (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Sep. 09, 2013	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Mar. 23, 2012
Debt Instrument [Line Items]
Loss on early extinguishment of debt		$ 1,500,000	$ 0	$ 0	$ 1,474,000
5½% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 300,000,000
Debt Instrument Offering Price Percentage in Addition to a Make-Whole Premium	100.00%
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest	101.00%
5½% Senior Notes [Member] | Prior to August 1, 2017 | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Redemption Date	Aug. 01, 2017
Debt Redemption Price Percent Of Principal Amount in Addition to a Make-Whole Premium	100.00%
5% Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount						$ 500,000,000
Debt Instrument Offering Price Percentage in Addition to a Make-Whole Premium						100.00%
Redemption Price Percent If Change In Control Occurs in Addition to Accrued and Unpaid Interest						101.00%

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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 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: 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=64930785&loc=d3e28551-108399

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12317-112629

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49170532&loc=d3e12355-112629

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