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Share-Based Compensation - Summary of Activity Related to Stock Options Granted under Company's Incentive Plan (Parenthetical) (Detail) (USD $)	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Value of closing stock price	$ 43.30us-gaap_SharePrice

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- Details

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

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