Changes in Reserves for Credit Losses Related to Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 10,396	$ 11,709
Provision for credit losses	9,090	3,756
Charge-offs	(8,107)	(6,045)
Recoveries of amounts previously charged-off	1,697	1,377
Currency translation	87	0
Balance, end of period	$ 13,163	$ 10,797