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Indebtedness - Senior Notes - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
Sep. 30, 2016
May 31, 2015
Sep. 30, 2017
Oct. 05, 2017
Dec. 31, 2016
Debt Instrument [Line Items]          
Aggregate principal amount     $ 2,877,349   $ 2,877,849
Senior Notes          
Debt Instrument [Line Items]          
Maximum redemption price of notes as percentage of principal amount     101.00%    
4.875% Senior Notes Due 2025          
Debt Instrument [Line Items]          
Aggregate principal amount   $ 750,000 $ 750,000   $ 750,000
Interest rate on notes   4.875% 4.875%   4.875%
Net proceeds after underwriting discounts and commissions   $ 737,400      
Underwriting discounts and commissions   $ 12,600      
Maximum redemption price of notes as percentage of principal amount   101.00%      
5.875% Senior Notes Due 2022          
Debt Instrument [Line Items]          
Aggregate principal amount     $ 329,244   $ 329,244
Interest rate on notes     5.875%   5.875%
5.875% Senior Notes Due 2022 | Subsequent Event          
Debt Instrument [Line Items]          
Interest rate on notes       5.875%  
5.875% Senior Notes Due 2022 | Senior Note Exchange Offer | Unsecured Debt          
Debt Instrument [Line Items]          
Interest rate on notes 5.875%        
Senior notes exchange amount $ 329,200        
5.00% Senior Notes Due 2023          
Debt Instrument [Line Items]          
Aggregate principal amount $ 741,531   $ 741,531   $ 741,531
Interest rate on notes 5.00%   5.00%   5.00%
5.00% Senior Notes Due 2023 | Subsequent Event          
Debt Instrument [Line Items]          
Interest rate on notes       5.00%  
5.00% Senior Notes Due 2022          
Debt Instrument [Line Items]          
Aggregate principal amount $ 580,032   $ 580,032   $ 580,032
Interest rate on notes 5.00%   5.00%   5.00%
5.00% Senior Notes Due 2022 | Subsequent Event          
Debt Instrument [Line Items]          
Interest rate on notes       5.00%  
5.75% Senior Notes Due 2021          
Debt Instrument [Line Items]          
Aggregate principal amount $ 475,952   $ 475,952   $ 475,952
Interest rate on notes 5.75%   5.75%   5.75%
5.75% Senior Notes Due 2021 | Subsequent Event          
Debt Instrument [Line Items]          
Interest rate on notes       5.75%