XML 53 R40.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Accumulated Other Comprehensive Loss - Additional Information (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 USD ($)
Accumulated Other Comprehensive Loss [Abstract] |
Amortization to be reclassified from OCI into income | $ 385

X
- Definition Accumulated Other Comprehensive Loss [Abstract] + References No definition available. + Details
Name: | fr_AccumulatedOtherComprehensiveLossAbstract
Namespace Prefix: | fr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossReclassificationFromAccumulatedOCIToIncomeEstimatedNetAmountToBeTransferred
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration