Debt - Debt (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Line of Credit Facility [Line Items]
Debt	$ 335,171	$ 294,063
Convertible Debt [Member]
Line of Credit Facility [Line Items]
Debt	99,122	0
Secured Debt [Member]
Line of Credit Facility [Line Items]
Debt	15,400	34,171
Other indebtedness [Member]
Line of Credit Facility [Line Items]
Debt	20,649	15,892
Senior secured credit facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Debt	0	44,000
Senior secured credit facility [Member] | Term loan facility [Member]
Line of Credit Facility [Line Items]
Debt	$ 200,000	$ 200,000