Employee Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Employee contribution percentage	60.00%
Employee contribution amount	$ 18,000
Defined Benefit Plan, contributions by employer	0
Contribution expense recognized by Indian entities	1,928,000	$ 1,951,000
Expected amortization out of comprehensive income	60,000
Provident Fund
Defined Benefit Plan Disclosure [Line Items]
Contribution expense recognized by Indian entities	5,900,000	6,500,000	$ 4,700,000
Gratuity Plan
Defined Benefit Plan Disclosure [Line Items]
Contribution expense recognized by Indian entities	3,500,000	3,700,000	$ 3,100,000
Accrued liability for retirement plan	$ 13,600,000	$ 12,300,000