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Capital Stock - Additional Information (Detail) - USD ($) | 12 Months Ended | 108 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2008
Class of Stock [Line Items] |  |  |  |  |
Preferred stock, shares authorized (shares) | 25,000,000 | 25,000,000 |  | 25,000,000 |
Preferred stock, par value (dollars per share) | $ 1 | $ 1 |  | $ 1 |
Common stock, share authorized (shares) | 725,000,000 | 725,000,000 |  | 725,000,000 |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |  | $ 0.001 |
Common stock, share issued (shares) | 86,149,975 | 72,711,371 |  | 86,149,975 |
Preferred stock, share issued (in shares) | 0 |  |  | 0 |
Number of common shares or units issued related to the exercise of share based compensation during the period | 100,000 | 200,000 | 1,800,000 |  |
Net cash proceeds | $ 327,419,000 | $ 575,368,000 | $ 452,061,000 |  |
Common stock conversion (in shares) | 1 |  |  |  |
Minimum percentage of shares acquired in exercisable rights | 20.00% |  |  |  |
Minimum percentage of common stock acquired by stockholders for higher thresholds | 15.00% |  |  |  |
Tender Offers [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Minimum percentage of shares acquired in exercisable rights | 20.00% |  |  |  |
Continuous Offering Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value of common units | $ 50,000,000.0 |  |  |  |
Number of shares issued | 1,300,000 |  |  |  |
Net cash proceeds | $ 9,300,000 |  |  |  |
Offering costs | $ 400,000 |  |  | $ 400,000 |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of common shares or units issued related to the exercise of share based compensation during the period | 12,000,000 |  |  |  |
Fair value of granted stock | $ 96,200,000 |  |  |  |
Repurchase of common stock, shares |  | 0 | 0 |  |
Repurchase of common stock (in shares) |  |  |  | 5,200,000 |
Common stock repurchased value |  |  |  | $ 162,300,000 |
Common stock repurchase, total remaining amount authorized | $ 37,700,000 |  |  | $ 37,700,000 |
Common Stock [Member] | Share Repurchase Program 2008 [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock repurchase, amount authorized |  |  |  |  | $ 200,000,000

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