Accounts Receivable Factoring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Receivables [Abstract]
Amount outstanding under accounts receivable transfer agreements without recourse	$ 106,709	$ 95,642	$ 106,709	$ 95,642
Total amount of accounts receivable factored without recourse			396,732	347,473
Costs incurred on sale of receivables without recourse	990	720	2,541	2,049
Amount outstanding under accounts receivable transfer agreements with recourse	7,097	13,727	7,097	13,727
Secured debt maturity period			1 year
Total amount of accounts receivable factored with recourse			45,577	69,809
Costs incurred on sale of receivables with recourse	$ 103	$ 106	$ 290	$ 327