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Estimated Fair Value of Outstanding Debt Balances (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | $ 868,000 | $ 600,000
Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 867,582 | 546,728
Revolving Credit Facility | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 268,000 |
Revolving Credit Facility | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 268,000 |
4.97% Series A Senior Notes, Due October 5th 2020 | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 300,000 | 300,000
4.97% Series A Senior Notes, Due October 5th 2020 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 303,966 | 283,534
4.27% Series B Senior Notes, Due June 14th 2022 | Carrying Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | 300,000 | 300,000
4.27% Series B Senior Notes, Due June 14th 2022 | Fair Value |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Total debt | $ 295,616 | $ 263,194

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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