Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities Eliminated from Financial Statement (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Feb. 28, 2013	Dec. 31, 2012
Receivables [Abstract]
Other assets	$ 58,923	$ 6,614	$ 41,263
Total assets	806,851	6,614	675,204
Other current liabilities	42,136	3,060	106,796
Other liabilities	146,087	43,054	82,416
Total	$ 691,205	$ 46,114	$ 549,439