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Earnings Per Share - Summary of Earnings Per Share, Basic and Diluted (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Earnings Per Share [Abstract] |  |  |
Net income | $ 174,937 | [1],[2] | $ 123,693
Denominator for basic earnings per share (in shares) | 89,765 | [1] | 92,108
Dilutive securities (in shares) | 3,485 |  | 2,452
Denominator for diluted earnings per share (in shares) | 93,250 | [1] | 94,560
Basic earnings per share (in dollars per share) | $ 1.95 | [1] | $ 1.34
Diluted earnings per share (in dollars per share) | $ 1.88 | [1] | $ 1.31
[1] | Reflects the January 1, 2018 adoption of Accounting Standards Update 2014-09, "Revenue from Contracts with Customers (Topic 606)" using the modified retrospective transition method. As a result of the application of the modified retrospective transition method, the Company's prior period results within its annual report on Form 10-K and quarterly reports on Form 10-Q will not be restated to reflect the impact of Topic 606. See footnote 1.
[2] | Reflects the impact of the Company's adoption of Accounting Standards Update 2016-18, Statement of Cash Flows (Topic 230), which was adopted by the Company on January 1, 2018 and applied retrospectively to results for 2017. The adoption of Topic 230 resulted in the statement of cash flows presenting the changes in the total of cash, cash equivalents and restricted cash. As a result, the Company will no longer present transfers between cash and cash equivalents and restricted cash in the consolidated statement of cash flows.

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