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Schedule of Rollforward of Noncontrolling Interest Balance (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Noncontrolling Interest [Line Items]    
Noncontrolling interest beginning balance $ 248,079us-gaap_MinorityInterest  
Net income attributable to noncontrolling interest 8,252us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 7,650us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Distributions to noncontrolling interest (3,654)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders  
Foreign currency translation adjustment (8,032)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentBeforeTaxPortionAttributableToNoncontrollingInterest  
Noncontrolling interest ending balance 245,241us-gaap_MinorityInterest  
Noncontrolling Interest    
Noncontrolling Interest [Line Items]    
Gain recorded in accumulated other comprehensive loss 651us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
 
Gain reclassified from accumulated other comprehensive loss into earnings $ (55)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember