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Shares Repurchased - Additional Information (Detail) - USD ($)		3 Months Ended
	Apr. 27, 2016	Mar. 31, 2018	Mar. 31, 2017	Apr. 11, 2018	Oct. 29, 2014
Subsequent Event [Member] | Maximum [Member]
Class of Stock [Line Items]
Total Leverage Ratio				175.00%
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Common stock purchase authorized amount					$ 100,000,000
Share repurchase program, increase in authorized amount	$ 60,000,000
Share repurchase program, extended term date	Apr. 27, 2019
Repurchased common stock, shares		60,508	346,529
Repurchased common stock, value		$ 734,000	$ 3,628,000
Dollar amount remaining available for future share repurchases		$ 87,880,000

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Amount of stock repurchase plan authorized.

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Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

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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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-Name Accounting Standards Codification
-Topic 505
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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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.

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Percentage of tier one capital to total leverage exposure, as defined by regulatory framework.

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The increased amount authorized by the entity's Board of Directors to the existing share repurchase program.

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