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Restricted Shares Activity (Detail) (Parent Company, USD $)
12 Months Ended
Dec. 31, 2014
Parent Company
 
Restricted Shares Roll Forward - Number of Shares  
Unvested, December 31, 2013 146,510us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Granted 152,852us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Vested (45,161)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Forfeited (34,797)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Unvested, December 31, 2014 219,404us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Restricted Shares Roll Forward - Weighted Average Grant Date Fair Value  
Unvested, December 31, 2013 $ 1,151.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Granted $ 1,815.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Vested $ 1,157.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Forfeited $ 1,346.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Unvested, December 31, 2014 $ 1,582.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember