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Earnings Per Share - Additional Information (Detail) - $ / shares | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | May 24, 2016
Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Participating securities outstanding | 0 | 0 | 0 | 0 |  |
Stock options, outstanding | 1,033,312 |  | 1,033,312 |  | 734,940 |
Stock options, weighted average exercise price | $ 26.99 |  | $ 26.99 |  | $ 20.80 |
Common stock excluded from calculation of diluted earnings per share | 329,409 | 162,544 | 485,520 | 326,572 |  |
2.125% Convertible Senior Notes due 2021 |  |  |  |  |  |
Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Notes, interest rate | 2.125% |  | 2.125% |  |  | 2.125%
Notes, due date |  |  | Jun. 01, 2021 |  |  |
Option To Purchase Common Stock |  |  |  |  |  |
Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Stock options, outstanding | 1,033,312 | 749,669 | 1,033,312 | 749,669 |  |
Stock options, weighted average exercise price | $ 26.99 | $ 20.84 | $ 26.99 | $ 20.84 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Computation of Earnings Per Share [Line Items] |  |  |  |  |  |
Common stock excluded from calculation of diluted earnings per share |  |  | 707,716 | 515,468 |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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