Employee Benefit Plans - Additional Information (Detail) (USD $)	9 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014 Provident Fund	Sep. 30, 2013 Provident Fund	Sep. 30, 2014 Provident Fund	Sep. 30, 2013 Provident Fund	Sep. 30, 2014 Gratuity Plan	Sep. 30, 2013 Gratuity Plan	Dec. 31, 2013 Gratuity Plan
Defined Benefit Plan Disclosure [Line Items]
Employee contribution percentage	60.00%
Employee contribution amount	$ 17,500
Defined Benefit Plan, contributions by employer	0
Contribution expense recognized by Indian entities		1,200,000	800,000	3,000,000	2,500,000	2,400,000	2,200,000
Accrued liability for retirement plan						$ 10,700,000		$ 8,900,000