Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Senior Notes - Summary of Senior Notes (Detail) - USD ($) $ in Millions	May 08, 2018	Jul. 14, 2010	May 07, 2008
May 2018 Senior Notes
Debt Instrument [Line Items]
Interest rate	5.25%
Maturity date	May 15, 2026
Series A
Debt Instrument [Line Items]
Amount			$ 41.0
Interest rate			6.37%
Maturity date			May 07, 2013
Series B
Debt Instrument [Line Items]
Amount			$ 40.0
Interest rate			6.37%
Maturity date			May 07, 2015
Series C
Debt Instrument [Line Items]
Amount			$ 63.0
Interest rate			6.71%
Maturity date			May 07, 2015
Series D
Debt Instrument [Line Items]
Amount			$ 131.0
Interest rate			7.18%
Maturity date			May 07, 2018
Series E
Debt Instrument [Line Items]
Amount		$ 60.0
Interest rate		4.72%
Maturity date		Jul. 14, 2016
Series F
Debt Instrument [Line Items]
Amount		$ 72.0
Interest rate		5.04%
Maturity date		Jul. 14, 2017
Series G
Debt Instrument [Line Items]
Amount		$ 28.0
Interest rate		5.42%
Maturity date		Jul. 14, 2019
Series H
Debt Instrument [Line Items]
Amount		$ 85.0
Interest rate		5.59%
Maturity date		Jul. 14, 2020