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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Parenthetical) (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restricted Stock Units (RSUs) |  |  |
Schedule of Restricted Stock Unit [Line Items] |  |  |
Weighted average grant date fair value per share | $ 43.19 | $ 28.54 | $ 29.44

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- Definition Schedule of Restricted Stock Unit [Line Items] + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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