Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities Eliminated from Financial Statement (Detail) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Feb. 28, 2013
Assets and Liabilities Eliminated upon Consolidation [Abstract]
Other assets				$ 6,614
Total assets	$ 780,332	$ 806,851	$ 783,286	6,614
Other current liabilities	52,268	42,136	52,185	3,060
Other liabilities				43,054
Total	$ 664,089	$ 691,205	$ 674,601	$ 46,114