Derivative Financial Instruments (Derivative Instruments, Gain (Loss) (Detail)	9 Months Ended
	Sep. 30, 2015 $ / shares
Product [Member]
Derivative [Line Items]
Derivative, Type of Instrument	Swap
Derivative, Inception Date	Apr. 15, 1
Derivative, Maturity Date	Mar. 16, 31
Underlying, Derivative Volume	500
Derivative Swap Type Fixed Price Per Share	$ 2.420
Product One [Member]
Derivative [Line Items]
Derivative, Type of Instrument	Swap
Derivative, Inception Date	Nov. 15, 1
Derivative, Maturity Date	Mar. 16, 31
Underlying, Derivative Volume	500
Derivative Swap Type Fixed Price Per Share	$ 2.260