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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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- 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 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 + Details
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- Definition 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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