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Stock Option Plans - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2015 CompensationPlan $ / shares shares	Dec. 31, 2008 shares	Dec. 31, 2007 shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock incentive plans	2
Option expiration period	10 years
Option vesting period	4 years
Closing share price (in usd per share) | $ / shares	$ 49.19
Options granted (in shares) | shares	225,000	20,000	73,403
Weighted average remaining contractual life of the Company's outstanding options	7 years 5 months 23 days
Weighted average remaining contractual life of the Company's exercisable options	6 years 1 month 18 days

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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-Name Accounting Standards Codification



-Topic 718



-SubTopic 10



-Section 50



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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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