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Shares Repurchased - Additional Information (Detail) - Three-Year Share Repurchase Program [Member] - USD ($)		3 Months Ended		6 Months Ended
	Apr. 27, 2016	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Oct. 29, 2014
Equity, Class of Treasury Stock [Line Items]
Common stock purchase authorized amount						$ 100,000,000
Repurchased common stock, value	$ 60,000,000	$ 99,000	$ 1,195,000	$ 35,654,000	$ 15,264,000
Share repurchase program, extended term date	Apr. 27, 2019
Repurchased common stock, shares		8,018	62,470	3,415,323	835,106
Repurchased shares, remaining for future purchases		$ 100,230,000		$ 100,230,000

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: 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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Topic 505
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

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-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

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-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Stock Repurchase Program Extended Termination Date

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