Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands				12 Months Ended
	Mar. 31, 2017	Mar. 01, 2017	Feb. 15, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Subsequent Event [Line Items]
Repayment of notes payable-principal				$ 2,969	$ 10,395	$ 78,890
Notes payable - principal				18,774	21,743
Preferred stock dividend				$ 18,000	$ 17,748
Subsequent Event [Member] | Series B Preferred Stock [Member]
Subsequent Event [Line Items]
Preferred stock dividend			$ 4,500
Preferred stock dividend payment date			Mar. 15, 2017
Second Lien Notes [Member] | Scenario Forecast [Member]
Subsequent Event [Line Items]
Repayment of notes payable-principal	$ 400
Repayment of notes payable-interest	4
Notes payable - principal	$ 18,400
Second Lien Notes [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Repayment of notes payable-interest		$ 600