Income Taxes - Summary of Tax Years Open for Examination (Detail)	9 Months Ended
	Sep. 30, 2013
United States [Member] | Minimum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2001
United States [Member] | Maximum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2012
India [Member] | Minimum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2006
India [Member] | Maximum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2012
Japan [Member] | Minimum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2007
Japan [Member] | Maximum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2012
United Kingdom [Member] | Minimum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2008
United Kingdom [Member] | Maximum [Member]
Schedule Of Income Taxes [Line Items]
Open tax year	2012