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Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2017 | May 31, 2017 | Jun. 30, 2017 | Jun. 30, 2016
Debt Instrument [Line Items] |  |  |  |
Repayment of senior notes |  |  | $ 300,000 | $ 240,000
4.7% Senior Unsecured Notes Due June 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior notes issued |  | $ 450,000 |  |
Debt instrument interest rate |  | 4.70% |  |
Debt instrument maturity date |  | 2027-06 |  |
Debt instrument, unamortized discount |  | $ 800 |  |
Debt instrument, issuance costs |  | $ 3,900 |  |
4.75% Senior Unsecured Notes Due April 2018 [Member] | Subsequent Event [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument interest rate | 4.75% |  |  |
Debt instrument maturity date | 2018-04 |  |  |
Repayment of senior notes | $ 300,000 |  |  |

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