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Debt - 5% Senior Notes - Additional Information (Detail) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2013
5% Senior Notes [Member]
Apr. 15, 2019
5% Senior Notes [Member]
Forecast [Member]
Apr. 15, 2018
5% Senior Notes [Member]
Forecast [Member]
Apr. 15, 2017
5% Senior Notes [Member]
Forecast [Member]
Apr. 16, 2016
5% Senior Notes [Member]
Forecast [Member]
Apr. 15, 2016
5% Senior Notes [Member]
Forecast [Member]
Debt Instrument [Line Items]              
Face amount of outstanding debt   $ 350,000,000          
Maturity year of note   2021          
Interest rate of Senior Notes   5.00%          
Maturity date for Notes   Apr. 15, 2021          
First semi-annual interest payment date   April 15          
Second semi-annual interest payment date   October 15          
Semi-annual interest payment beginning date   Oct. 15, 2013          
Redemption price expressed as percentage of principal amount     100.00% 101.25% 102.50% 100.00% 103.75%
Net proceeds from issuance of senior notes $ 350,000,000 $ 342,000,000