Accounts Receivable Factoring - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Receivables [Abstract]
Amount outstanding under accounts receivable transfer agreements without recourse	$ 76,729		$ 76,729		$ 95,951
Total amount of accounts receivable factored without recourse			149,319	$ 276,523
Costs incurred on sale of receivables without recourse	559	$ 836	1,190	1,551
Amount outstanding under accounts receivable transfer agreements with recourse	4,648		$ 4,648		$ 8,292
Secured debt maturity period			1 year
Total amount of accounts receivable factored with recourse			$ 17,303	31,994
Costs incurred on sale of receivables with recourse	$ 29	$ 95	$ 77	$ 187