Series D Preferred Shares - Additional Information (Detail) $ / shares in Units, $ in Thousands	Jun. 30, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) Covenant	Oct. 01, 2012 USD ($) $ / shares shares
Temporary Equity [Line Items]
Aggregate purchase price under Securities Purchase Agreement | $	$ 100,000
Stock Appreciation Rights				6,735,667
Warrants and investor SARs | $	$ 29,300	$ 26,200
Adjusted
Temporary Equity [Line Items]
Warrants exercisable for common shares	11,035,875
Stock Appreciation Rights	7,485,045
ARS VI
Temporary Equity [Line Items]
Aggregate purchase price under Securities Purchase Agreement | $				$ 100,000
Preferred Series D
Temporary Equity [Line Items]
Preferred shares with warrants				9,931,000
Warrants Exercise Price | $ / shares				$ 6.00
Preferred Series D | Adjusted
Temporary Equity [Line Items]
Warrants Exercise Price | $ / shares	$ 5.39
Preferred Series D | ARS VI
Temporary Equity [Line Items]
Cumulative redeemable preferred shares, shares issued				4,000,000
Cumulative Redeemable Preferred Shares, par value | $ / shares				$ 0.01
Number of covenants | Covenant			2
Consideration paid under Securities Purchase Agreement | $			$ 450