INTANGIBLE ASSETS OTHER THAN GOODWILL (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013
INTANGIBLE ASSETS OTHER THAN GOODWILL [Abstract]
Favorable Lease Terms Accelerated Amortization	$ 1,619

Write-off of the carrying amount of favorable lease terms, under the caption of ?Depreciation and Amortization?, due to the revision of the remaining useful economic life of the related favorable lease.

No definition available.

Name:	nna_FiniteLivedIntangibleAssetsAcceleratedAmortization
Namespace Prefix:	nna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration