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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 25, 2011 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, value of shares authorized to repurchase | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Stock repurchase, shares |  |  |  |  |  |  |  |  |  | 107,000 | 434,600 |
Value of shares repurchased |  |  |  |  |  |  |  |  |  | 2,875 | 11,501 | 2,007
Average price of repurchased shares |  |  |  |  |  |  |  |  |  | $ 26.87 | $ 26.46 |
Cash dividend paid |  | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.16 | $ 0.15 | $ 0.15 | $ 0.64 | $ 0.62 | $ 0.60
Dividend payment to common shareholders |  |  |  |  |  |  |  |  |  | $ 33,975 | $ 32,686 | $ 31,373
Dividend declared date |  |  |  |  |  |  |  |  |  | Feb. 10, 2014 |  |
Cash dividend to be paid |  |  |  |  |  |  |  |  |  | $ 0.16 |  |
Dividend to be paid date |  |  |  |  |  |  |  |  |  | Mar. 14, 2014 |  |
Dividend declared, shareholders of record date |  |  |  |  |  |  |  |  |  | Mar. 03, 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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