Changes in Reserves for Credit Losses Related to Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 10,396	$ 11,709
Provision for credit losses	23,154	13,686
Charge-offs	(25,776)	(21,150)
Recoveries of amounts previously charged-off	5,730	5,031
Currency translation	(58)	(322)
Balance, end of period	$ 13,446	$ 8,954