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Stockholders' Equity - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 07, 2016 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Jul. 31, 2015 | Aug. 31, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  |  |  |  | 20,000,000
Treasury stock value |  | $ 1,304,700,000 |  | $ 1,304,700,000 |  | $ 1,265,700,000 | [1] |  |
Common stock in treasury, shares |  | 30,429,339 |  | 30,429,339 |  | 29,612,337 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared date | Jul. 07, 2016 |  |  |  |  |  |  |  |
Dividends declared payable date | Sep. 16, 2016 |  |  |  |  |  |  |  |
Dividends declared date of record | Sep. 02, 2016 |  |  |  |  |  |  |  |
Dividends per share on common stock | $ 0.16 |  |  |  |  |  |  |  |
Common Stock Repurchase Set Two | Share Trading Plan [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock value |  |  | $ 80,000,000 |  | $ 125,000,000 |  |  |  |
Number of common stock shares repurchased |  |  | 1,610,287 |  | 2,624,434 |  |  |  |
Common Stock Repurchase Set One | Share Trading Plan [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock value |  | $ 20,000,000 |  | $ 52,000,000 |  |  |  |  |
Number of common stock shares repurchased |  | 435,140 |  | 1,134,485 |  |  |  |  |
Accelerated Shares Repurchase Agreement [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Treasury stock value |  |  | $ 25,000,000 |  | $ 25,000,000 |  |  |  |
Common stock in treasury, shares |  |  | 546,574 |  | 546,574 |  |  |  |
Common stock repurchase price per share |  |  |  |  | $ 45.74 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  | $ 1,500,000,000 |
[1] | As of January 1, 2016, we have adopted ASU 2015-03 and ASU 2015-15 with retrospective application. This resulted in a reclassification from other non-current assets to long-term debt, less current portion for debt issuance costs. Refer to Note 2, “Recently Issued Accounting Standards” of the notes to the condensed consolidated financial statements for further details.

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