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Subsequent Events - Additional Information (Detail) (USD $)
1 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Apr. 16, 2019
Subsequent Event [Member]
Apr. 16, 2018
Subsequent Event [Member]
Apr. 16, 2017
Subsequent Event [Member]
Apr. 16, 2016
Subsequent Event [Member]
Apr. 15, 2016
Subsequent Event [Member]
Apr. 18, 2013
Subsequent Event [Member]
Apr. 30, 2013
5% Senior Notes [Member]
Subsequent Event [Member]
Apr. 18, 2013
$1 Billion Credit Facility [Member]
Subsequent Event [Member]
Apr. 18, 2013
$1 Billion Credit Facility [Member]
Subsequent Event [Member]
Senior Secured Revolving Credit Facility [Member]
Apr. 18, 2013
$1 Billion Credit Facility [Member]
Subsequent Event [Member]
Senior Secured Term Loan Facility [Member]
Mar. 31, 2013
$925 Million Credit Facility [Member]
Subsequent Event [Member]
Subsequent Event [Line Items]                          
Face amount of outstanding debt                 $ 350,000,000        
Maturity year of note                 2021        
Interest rate of Senior Notes                 5.00%        
Debt Instrument, maturity date                 Apr. 15, 2021        
First semi-annual interest payment date                 April 15        
Second semi-annual interest payment date                 October 15        
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                 342,000,000        
Total credit facility               925,000,000   1,000,000,000 700,000,000 300,000,000  
Total Debt 1,092,081,000 1,031,863,000                 154,000,000    
Maturity Date                   Apr. 18, 2017      
Percentage of margin on LIBOR                   1.75%      
Write-off of deferred financing costs related to refinancing of credit facility $ 9,660,000 $ 11,347,000                     $ 7,200,000