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Estimated Fair Value of Outstanding Debt Balances (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value of Debt | $ 600,000 | $ 855,000
Fair value of Debt | 546,728 | 793,441
Term Loan Facility |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value of Debt |  | 70,000
Fair value of Debt |  | 70,000
2015 Term Loan |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value of Debt |  | 185,000
Fair value of Debt |  | 185,000
4.97% Series A Senior Notes, Due October 5th 2020 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value of Debt | 300,000 | 300,000
Fair value of Debt | 283,534 | 279,635
4.27% Series B Senior Notes, Due June 14th 2022 |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Carrying value of Debt | 300,000 | 300,000
Fair value of Debt | $ 263,194 | $ 258,806

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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