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Senior Notes - Additional Information (Detail) - USD ($) $ in Thousands | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014
Debt Instrument [Line Items] |  |  |
Repayments of term loan |  | $ 857,396 | $ 94,421
Total fees, excluding underwriting discounts, incurred for the issuance of senior notes |  | 4,540 | $ 705
Debt extinguishment costs |  | $ 3,300 |
3.625% Senior Unsecured Notes Due February 2025 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from unsecured notes payable | $ 500,000 |  |
Debt Instrument, Stated Percentage | 3.625% |  |
Debt Instrument Maturity Date | 2025-02 |  |
Total fees, excluding underwriting discounts, incurred for the issuance of senior notes | $ 1,100 |  |
Unsecured Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of term loan | 350,000 |  |
Secured Term Loan [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of term loan | $ 100,000 |  |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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