Accounts Receivable Factoring - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Receivables [Abstract]
Amount outstanding under accounts receivable transfer agreements without recourse	$ 72,763		$ 95,951
Total amount of accounts receivable factored without recourse	79,799	139,130
Costs incurred on sale of receivables without recourse	631	798
Amount outstanding under accounts receivable transfer agreements with recourse	4,833		8,292
Secured debt maturity period	1 year
Total amount of accounts receivable factored with recourse	7,918	15,695
Costs incurred on sale of receivables with recourse	$ 48	$ 92