Receivables - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Receivables [Abstract]
Allowance for doubtful accounts receivables	$ 22,805,000		$ 23,017,000
Bad debt expense, net of recoveries	148,000	1,281,000
Charge-offs, foreign currency translation and other adjustments	(360,000)	441,000
Receivables deemed past due or uncollectible	24,729,000		25,604,000
Interest-bearing financing fee receivables	68,381,000		76,481,000
Past due or uncollectible amounts	0		0
Financing receivables, allowance for credit losses	0		0
Aggregate carrying amount of non-interest bearing receivables	$ 391,499,000		$ 401,562,000