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Partners' Capital - General Partnership and Limited Partnership Units Outstanding, Including Unvested General Partner Restricted Units (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
General Partnership and Limited Partnership Units Outstanding [Roll Forward]      
Balance 114,578,163fr_GeneralPartnersCapitalAccountAndLimitedPartnershipCapitalAccountUnitsOutstanding 103,470,254fr_GeneralPartnersCapitalAccountAndLimitedPartnershipCapitalAccountUnitsOutstanding 92,044,769fr_GeneralPartnersCapitalAccountAndLimitedPartnershipCapitalAccountUnitsOutstanding
Issuance of General Partner Units 219,695us-gaap_GeneralPartnersCapitalAccountUnitsIssued 10,853,693us-gaap_GeneralPartnersCapitalAccountUnitsIssued 11,085,905us-gaap_GeneralPartnersCapitalAccountUnitsIssued
Issuance of General Partner Restricted Units 319,055fr_GeneralPartnersCapitalAccountRestrictedUnitsIssued 284,461fr_GeneralPartnersCapitalAccountRestrictedUnitsIssued 565,137fr_GeneralPartnersCapitalAccountRestrictedUnitsIssued
Repurchase and Retirement of Restricted Units (141,410)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation (30,245)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation (225,557)us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Balance 114,975,503fr_GeneralPartnersCapitalAccountAndLimitedPartnershipCapitalAccountUnitsOutstanding 114,578,163fr_GeneralPartnersCapitalAccountAndLimitedPartnershipCapitalAccountUnitsOutstanding 103,470,254fr_GeneralPartnersCapitalAccountAndLimitedPartnershipCapitalAccountUnitsOutstanding