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Stockholder's Equity - Cumulative Convertible Preferred Stock (Detail) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Convertible Preferred Stock [Line Items]
Shares issued and outstanding	12us-gaap_PreferredStockSharesOutstanding	30us-gaap_PreferredStockSharesOutstanding
Common shares resulting if converted	35	100
Series A [Member]
Convertible Preferred Stock [Line Items]
Shares issued and outstanding	10	20
Conversion factor	2.50%	2.50%
Common shares resulting if converted	25	50
Series M [Member]
Convertible Preferred Stock [Line Items]
Shares issued and outstanding	2	10
Conversion factor	5.00%	5.00%
Common shares resulting if converted	10	50