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Treasury Stock - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 25, 2013 | Jun. 30, 2013
Stockholders Equity [Line Items] |  |
Additional amount authorized by Board of Directors | $ 25,000 |
Authorization amount for repurchase of common stock | 75,000 |
Expiration date on repurchase authorizations |  | Sep. 30, 2014
Common stock acquired, shares |  | 318
Aggregate cost shares of common stock |  | 7,518
Since Approval of Share Repurchase Plan [Member] |  |
Stockholders Equity [Line Items] |  |
Common stock acquired, shares |  | 2,727
Aggregate cost shares of common stock |  | 46,654
Remaining authorized repurchase amount |  | $ 28,346

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + 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 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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