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Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 1 Months Ended
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Apr. 30, 2013 Repurchase Of Equity Maximum | Apr. 30, 2014 Subsequent Event Repurchase Of Equity Maximum | Apr. 30, 2014 Subsequent Event Dividend Declared [Member]
Subsequent Event [Line Items] |  |  |
Declared dividend |  |  | $ 0.18
Authorized repurchase of Company common stock | $ 250 | $ 850 |

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- Definition Aggregate dividends declared 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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Period Type: | duration

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- Definition Amount of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration