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Benefit Plans - Activities for Unvested Stock Option Awards (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified |  |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Unvested stock option awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of Options Outstanding, Beginning Balance |  |  |  |  | 561
Number of Options, Granted |  |  |  |  | 345
Number of options, Vested |  |  |  |  | (269)
Number of Options, Forfeited |  |  |  |  | (28)
Number of Options Outstanding, Ending Balance |  |  |  |  | 609
Weighted-Average Exercise Price, Beginning balance | $ 24.77 | $ 25.70 | $ 25.35 | $ 28.28 | $ 5.21
Weighted-Average Grant-Date Fair Value, Granted |  |  |  |  | $ 5.31
Weighted-Average Grant-Date Fair Value, Vested |  |  |  |  | $ 5.25
Weighted-Average Grant-Date Fair Value, Forfeited |  |  |  |  | $ 5.40
Weighted-Average Exercise Price, Ending balance | $ 24.77 | $ 25.70 | $ 25.35 | $ 28.28 | $ 5.26

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options forfeited. + References No definition available. + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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