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Related Party Transactions - Additional Information (Detail) - $ / shares	Aug. 23, 2016	Aug. 12, 2016	Jan. 04, 2016	Aug. 11, 2015
Caroline S Vaccariello [Member]
Related Party Transaction [Line Items]
Purchase of common shares		4,450	91
Common shares price per share		$ 35.50	$ 42.10
Number of trading days to be considered for average price of stock repurchased		30 days	30 days
Trust [Member]
Related Party Transaction [Line Items]
Purchase of common shares	27,448			30,713
Common shares price per share	$ 44.66			$ 35.00
Number of trading days to be considered for average price of stock repurchased	30 days			30 days

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Number of trading days to be considered for average price of stock repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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