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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Dividends declared per share, in dollars per share | $ 0.73 | $ 0.69 | $ 1.46 | $ 1.38
Net income allocated to PRS | $ 0.2 | $ 0.2 | $ 0.3 | $ 0.5
Employee Stock Option |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock excluded from computation of diluted net income per share | 0 | 0 | 0 | 0
Stock-Settled Appreciation Rights (SARs) |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock excluded from computation of diluted net income per share | 2,668 | 2,647 | 2,322.5 | 1,323.5

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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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