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Stockholder's Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended
--- | --- | ---
Jul. 25, 2011 | Mar. 31, 2014 | Mar. 31, 2013
Equity [Abstract] |  |  |
Common stock, value of shares authorized to repurchase | $ 200,000 |  |
Stock repurchase, shares |  | 32,000 |
Value of shares repurchased |  | 945 |
Average price of repurchased shares |  | $ 29.81 |
Cash dividend paid |  | $ 0.16 | $ 0.16
Dividend payment to common shareholders |  | $ 8,553 | $ 8,448
Dividend declared date |  | May 05, 2014 |
Cash dividend to be paid |  | $ 0.165 |
Dividend to be paid date |  | Jun. 13, 2014 |
Dividend declared, shareholders of record date |  | Jun. 02, 2014 |

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- 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 + Details
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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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