Accounts Receivable - Summary of Accounts Receivable Other (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Receivables [Abstract]
Other taxes receivable	$ 28,743	$ 31,392
Receivables from unconsolidated affiliates	12,816	20,061
Accrued unbilled revenue	14,021	15,442
Intercompany unbilled cost	5,373	3,978
Employee receivables	4,376	4,336
Other	1,360	4,706
Accounts receivable—other	$ 66,689	$ 79,915