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Fair Value of Senior Notes (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Series 2005A Tranche B [Member]
 
Fair Value of Financial Instruments [Line Items]  
Fair Value of Senior Notes $ 59,298
Series 2005A Tranche C [Member]
 
Fair Value of Financial Instruments [Line Items]  
Fair Value of Senior Notes 61,019
Series 2007A Tranche A [Member]
 
Fair Value of Financial Instruments [Line Items]  
Fair Value of Senior Notes 9,590
Series 2007A Tranche B [Member]
 
Fair Value of Financial Instruments [Line Items]  
Fair Value of Senior Notes 8,594
Series 2007A Tranche C [Member]
 
Fair Value of Financial Instruments [Line Items]  
Fair Value of Senior Notes 26,190
Series 2007A Tranche D [Member]
 
Fair Value of Financial Instruments [Line Items]  
Fair Value of Senior Notes $ 40,497