Basis of Presentation and Significant Accounting Policies - Summary of Accounts Receivable Other (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Receivables [Abstract]
Other taxes receivable	$ 26,874	$ 14,934
Receivables from unconsolidated affiliates	19,842	36,181
Accrued unbilled revenue	13,278	15,696
Intercompany unbilled cost	7,248	5,373
Employee receivables	4,286	4,532
Foreign currency forward contracts	328	11,641
Other	3,885	916
Accounts receivable-other	$ 75,741	$ 89,273