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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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