Minority Investments - Schedule of Net Investment Activity (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Minority interest in net losses		$ 2,155	$ (644)
Impairment		(746)	$ (3,464)
Tres Amigas
Schedule Of Results Related To Equity Accounted Investees [Line Items]
Beginning Balance	$ 1,102	1,102
Minority interest in net losses		(356)
Impairment	$ (746)	$ (746)