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Fair Value of Senior Notes (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
Series 2005A Tranche C [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes $ 60,271
Series 2007A Tranche B [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes 8,367
Series 2007A Tranche C [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes 25,742
Series 2007A Tranche D [Member]  
Fair Value Of Financial Instruments [Line Items]  
Fair Value of Senior Notes $ 40,555