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Stockholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended
	Jul. 25, 2011	Mar. 31, 2017	Mar. 31, 2016
Equity [Abstract]
Common stock, value of shares authorized to repurchase	$ 200,000,000
Stock repurchase, shares	1,770,000	0	45,000
Value of shares repurchased	$ 52,000,000		$ 1,545,000
Average price of repurchased shares			$ 34.50
Cash dividends per common share		$ 0.175	$ 0.170
Dividend payment to common shareholders		$ 9,419,000	$ 9,056,000

X

- Definition

Average price of repurchased shares.

+ References

No definition available.

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X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ 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

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
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-Publisher FASB
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-Glossary Financing Activities
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- Definition

Amount of stock repurchase plan authorized.

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No definition available.

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- Definition

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
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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
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