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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Liquidation Basis of Accounting [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Mar. 31, 2015
LIABILITIES    
Liquidating distributions payable $ 4,612 $ 7,714
Fair Value, Measurements, Recurring [Member]    
ASSETS    
Total Assets 664,309 968,071
LIABILITIES    
Liquidating distributions payable 4,612 7,714
Fair Value, Measurements, Recurring [Member] | Cash Equivalents [Member] | Money Market Funds [Member]    
ASSETS    
Total Assets 21,136 19,150
Fair Value, Measurements, Recurring [Member] | Marketable Securities [Member] | U.S. Treasury Bills [Member]    
ASSETS    
Total Assets 637,179  
Fair Value, Measurements, Recurring [Member] | Marketable Securities [Member] | U.S. Government Agency Securities [Member]    
ASSETS    
Total Assets 5,994  
Fair Value, Measurements, Recurring [Member] | Marketable Securities [Member] | Municipal Commercial Paper and Variable Demand Notes [Member]    
ASSETS    
Total Assets   12,064
Fair Value, Measurements, Recurring [Member] | Marketable Securities [Member] | Corporate Commercial Paper [Member]    
ASSETS    
Total Assets   18,880
Fair Value, Measurements, Recurring [Member] | Holdings of New GM Securities [Member] | New GM Common Stock [Member]    
ASSETS    
Total Assets   427,151
Fair Value, Measurements, Recurring [Member] | Holdings of New GM Securities [Member] | New GM Warrants [Member]    
ASSETS    
Total Assets   490,826
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
ASSETS    
Total Assets 21,136 937,127
LIABILITIES    
Liquidating distributions payable 4,612 7,714
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cash Equivalents [Member] | Money Market Funds [Member]    
ASSETS    
Total Assets 21,136 19,150
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Holdings of New GM Securities [Member] | New GM Common Stock [Member]    
ASSETS    
Total Assets   427,151
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Holdings of New GM Securities [Member] | New GM Warrants [Member]    
ASSETS    
Total Assets   490,826
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
ASSETS    
Total Assets 643,173 30,944
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Marketable Securities [Member] | U.S. Treasury Bills [Member]    
ASSETS    
Total Assets 637,179  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Marketable Securities [Member] | U.S. Government Agency Securities [Member]    
ASSETS    
Total Assets $ 5,994  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Marketable Securities [Member] | Municipal Commercial Paper and Variable Demand Notes [Member]    
ASSETS    
Total Assets   12,064
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Marketable Securities [Member] | Corporate Commercial Paper [Member]    
ASSETS    
Total Assets   $ 18,880