Pension and Other Employee Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
US Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 0
Interest cost	1,016	987
Expected return on plan assets	(770)	(882)
Non-cash impact of partial pension settlement	0	0
Amortization of actuarial losses	213	168
Net periodic benefit cost	462	273
Non-US Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	92	92
Interest cost	171	181
Expected return on plan assets	(7)	(7)
Non-cash impact of partial pension settlement	(149)	0
Amortization of actuarial losses	203	217
Net periodic benefit cost	310	483
Total Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	95	92
Interest cost	1,187	1,168
Expected return on plan assets	(777)	(889)
Non-cash impact of partial pension settlement	(149)	0
Amortization of actuarial losses	416	385
Net periodic benefit cost	$ 772	$ 756