Commitments, Contingencies and Guarantees - Summary of Contractual Obligations (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Secured Loan Arrangements [Member]	Dec. 31, 2012 Secured Loan Arrangements [Member]	Dec. 31, 2013 8.75% Convertible Note [Member]	Dec. 31, 2013 4.50% Convertible Notes [Member]	Dec. 31, 2012 4.50% Convertible Notes [Member]	Jul. 29, 2011 4.50% Convertible Notes [Member]	Dec. 31, 2013 8.125% Convertible Notes [Member]	Dec. 31, 2013 Interest on Notes Payable [Member]	Dec. 31, 2013 Interest on Notes Payable [Member] 8.125% Convertible Notes [Member]
Loss Contingencies [Line Items]
Sub-lease payments receivables	$ 12,700,000
Convertible notes rate				8.75%	4.50%	4.50%	4.50%	8.125%
Principal amount of notes		1,600,000		150,000,000	160,000,000	160,000,000	160,000,000	112,500,000
Carrying value of note					147,900,000			108,900,000
Carrying value of secured loan		1,600,000	37,600,000
Total contractual obligations more than 5 years	$ 390,286,000								$ 214,398,000	$ 214,400,000