Quarterly report pursuant to Section 13 or 15(d)

Non-Controlling Interests - Summary Of Components of Non-Controlling Interests in Loss of Consolidated Entities (Detail)

v2.4.1.9
Non-Controlling Interests - Summary Of Components of Non-Controlling Interests in Loss of Consolidated Entities (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Noncontrolling Interest [Line Items]    
Non-controlling interests in loss of consolidated entities $ (479)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest $ 0us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Mustang Therapeutics, Inc [Member]    
Noncontrolling Interest [Line Items]    
Non-controlling interests in loss of consolidated entities 226us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbio_MustangTherapeuticsIncMember 		 
Non-controlling ownership (See Note 4) 10.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbio_MustangTherapeuticsIncMember 		 
Checkpoint Therapeutics, Inc [Member]    
Noncontrolling Interest [Line Items]    
Non-controlling interests in loss of consolidated entities 93us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbio_CheckpointTherapeuticsIncMember 		 
Non-controlling ownership (See Note 4) 15.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbio_CheckpointTherapeuticsIncMember 		 
Coronado SO Co, Inc [Member]    
Noncontrolling Interest [Line Items]    
Non-controlling interests in loss of consolidated entities $ 160us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbio_CoronadoSoCoIncMember 		 
Non-controlling ownership (See Note 4) 13.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= fbio_CoronadoSoCoIncMember