Significant Accounting Policies - Schedule of Interest Income and Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accounting Policies [Abstract]
Interest Income	$ 3,992	$ 1,170	$ 6,022	$ 1,847
Interest Expense	(4,169)	(1,951)	(6,992)	(3,845)
Interest, net	$ (177)	$ (781)	$ (970)	$ (1,998)