Debt - Schedule of Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Line of Credit Facility [Line Items]
Debt	$ 389,782	$ 432,744
6% Tangible Equity Units [Member]
Line of Credit Facility [Line Items]
Debt	8,768	17,154
Term Loan Facility [Member] | Senior Secured Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt		200,000
Senior Notes [Member]
Line of Credit Facility [Line Items]
Debt	230,560	250,000
Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt	106,762	103,194
Secured Promissory Notes [Member]
Line of Credit Facility [Line Items]
Debt	15,400	15,400
Other Indebtedness [Member]
Line of Credit Facility [Line Items]
Debt	$ 28,292	$ 46,996