Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities Eliminated from Financial Statement (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Feb. 28, 2013
Receivables [Abstract]
Other assets				$ 6,614
Total assets	776,219	806,851	767,578	6,614
Other current liabilities	46,233	42,136	43,177	3,060
Other liabilities				43,054
Total	$ 656,081	$ 691,205	$ 637,892	$ 46,114