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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract] |  |  |
Number of shares repurchased | 40,241 us-gaap_StockRedeemedOrCalledDuringPeriodShares | 6,787 us-gaap_StockRedeemedOrCalledDuringPeriodShares |
Average price of shares repurchased | $ 40.88 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 37.70 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Shares remaining to be repurchased | 194,723 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased | 234,964 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased | 194,723 us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased

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- Details
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- Definition Number of stock bought back by the entity at the exercise price or redemption price. + References Reference 1: 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 + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: 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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