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Stockholders' Deficit - Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Apr. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2014
Apr. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance $ 39   $ 58   $ (592) $ (1,952)
Other comprehensive income (loss) before reclassifications   $ (24)       (2,887)
Amounts reclassified from accumulated other comprehensive income (loss)   655       4,247
Other comprehensive income 19 631 (51) $ 19 631 1,360
Ending balance 58 39 7 58 39 (592)
Marketable Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance 39   58   27 4
Other comprehensive income (loss) before reclassifications   12       23
Other comprehensive income   12 (51) 19   23
Ending balance $ 58 39 $ 7 $ 58 39 27
Commodity Hedges [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance         $ (619) 413
Other comprehensive income (loss) before reclassifications   (36)       (1,653)
Amounts reclassified from accumulated other comprehensive income (loss)   655       621
Other comprehensive income   $ 619       (1,032)
Ending balance           (619)
Interest Rate Swaps [Member]            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Beginning balance           (2,369)
Other comprehensive income (loss) before reclassifications           (1,257)
Amounts reclassified from accumulated other comprehensive income (loss)           3,626
Other comprehensive income           $ 2,369