Variable Interest Entities - Schedule of Carrying Value of the Assets and Liabilities Eliminated from Financial Statement Related to the 2009 Entity (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Variable Interest Entity [Line Items]
Prepaid expenses and other current assets	$ (48,478)	$ (28,400)	$ (21,671)
Total assets	(767,506)	(806,851)	(739,302)
Other current liabilities	(27,838)	(42,136)	(57,485)
Total liabilities	(635,971)	(691,205)	(598,067)
2009 Entity [Member]
Variable Interest Entity [Line Items]
Total assets	(30,136)
Other current liabilities	(624)
Other liabilities	(1,940)
Total liabilities	(125,106)
Consolidation, Eliminations [Member] | 2009 Entity [Member]
Variable Interest Entity [Line Items]
Prepaid expenses and other current assets	3,260
Total assets	3,260
Other current liabilities	23,887
Other liabilities	90,974
Total liabilities	$ 114,861