Derivatives - Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts, Assets		$ 1,192	$ 1,868
Derivative contracts, Liabilities		4,097	4,153
Notional Amounts	[1]	4,639,713	11,776,260
FX/Commodities Options [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts, Assets			26
Derivative contracts, Liabilities		59
Notional Amounts	[1]	3,392	4,487
FX Swaps [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts, Assets		1,047	1,278
Derivative contracts, Liabilities		1,018	2,244
Notional Amounts	[1]	473,440	555,519
Forwards [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts, Assets		145	564
Derivative contracts, Liabilities		2,431	1,285
Notional Amounts	[1]	81,842	110,051
Futures [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative contracts, Liabilities		589	624
Notional Amounts	[1]	$ 4,081,039	$ 11,106,203

[1] Notional amounts represent the sum of gross long and short derivative contracts, an indication of the volume of the Company’s derivative activity, and do not represent anticipated losses.