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Derivative Financial Instruments - Effects of Derivative Instruments on Financial Statements (Detail) - Derivatives Designated as Hedges [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments Gain Loss [Line Items]    
Amount of gain (loss) recognized in other comprehensive income (loss) $ 481 $ 5,602
Cost of operations [Member]    
Derivative Instruments Gain Loss [Line Items]    
Gain reclassified from AOCI to Cost of operations (238) (3,515)
Other non-operating expense [Member]    
Derivative Instruments Gain Loss [Line Items]    
Ineffective portion and amount excluded from effectiveness testing: gain (loss) recognized in Other non-operating income (expense) $ 310 $ 305