Employee Benefit Plans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Employee contribution percentage			60.00%
Employee contribution amount			$ 18,000
Defined Benefit Plan, contributions by employer			0
Provident Fund
Defined Benefit Plan Disclosure [Line Items]
Contribution expense recognized by Indian entities	$ 1,500,000	$ 1,500,000	4,600,000	$ 4,800,000
Gratuity Plan
Defined Benefit Plan Disclosure [Line Items]
Contribution expense recognized by Indian entities	900,000	$ 900,000	2,700,000	$ 2,800,000
Accrued liability for retirement plan	$ 13,400,000		$ 13,400,000		$ 12,300,000