Debt Facilities - Components of Convertible Subordinates Notes (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Long term debt, gross	$ 1,243,699	$ 593,471
Less the amount representing debt discount and debt issuance cost	(2,681)	(3,477)
Total long term debt	5,245,768
Convertible Subordinated Debt [Member] | 4.75% Convertible Subordinated Notes [Member]
Debt Instrument [Line Items]
Equity component	42,091	44,278
Long term debt, gross	150,082	157,885
Less the amount representing debt discount and debt issuance cost	(3,961)	(12,656)
Total long term debt	$ 146,121	$ 145,229