Annual report pursuant to Section 13 and 15(d)

Intangible Assets (Parenthetical) (Detail)

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Intangible Assets (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Intangible Assets [Line Items]    
Impairment of a favorable lease $ 479us-gaap_ImpairmentOfIntangibleAssetsFinitelived $ 708us-gaap_ImpairmentOfIntangibleAssetsFinitelived