Debt - Debt (Detail)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013	Nov. 27, 2013	Feb. 26, 2013
Convertible Debt
Line of Credit Facility [Line Items]
Average interest rate	3.75%	3.75%
Variable and fixed interest rates ranging, minimum	3.75%		3.75%		3.75%
6% Tangible Equity Units
Line of Credit Facility [Line Items]
Average interest rate	6.00%	6.00%
Secured Promissory Notes
Line of Credit Facility [Line Items]
Average interest rate		3.42%
Senior Secured Credit Facility | Revolving Credit Facility
Line of Credit Facility [Line Items]
Average interest rate	8.50%	8.50%
6% Tangible Equity Units
Line of Credit Facility [Line Items]
Variable and fixed interest rates ranging, minimum			6.00%	6.00%
Minimum | Other Indebtedness
Line of Credit Facility [Line Items]
Variable and fixed interest rates ranging, minimum	5.00%
Maximum | Other Indebtedness
Line of Credit Facility [Line Items]
Variable and fixed interest rates ranging, minimum	5.50%