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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 17, 2017 | Feb. 15, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Jul. 31, 2015 | Aug. 31, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  | $ 2,200,000,000 |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  | 20,000,000
Number of common stock shares repurchased |  |  | 0 | 699,345 |  |
Treasury stock value |  |  |  | $ 32,000,000 |  |
Dividends declared date |  | Feb. 15, 2017 |  |  |  |
Dividends per share on common stock |  | $ 0.16 |  |  |  |
Dividends declared paid date |  | Mar. 17, 2017 |  |  |  |
Dividends declared date of record |  | Mar. 03, 2017 |  |  |  |
Dividends paid on common stock | $ 31,200,000 |  | $ 31,400,000 | $ 26,200,000 |  |
Maximum [Member] |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 1,500,000,000 |
Stock repurchase program, additional authorized amount |  |  | $ 1,500,000,000 |  |  |

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