Income Taxes - Summary of Tax Years Open for Examination (Detail)	6 Months Ended
	Jun. 30, 2013
United States | Minimum
Schedule Of Income Taxes [Line Items]
Open tax year	2001
United States | Maximum
Schedule Of Income Taxes [Line Items]
Open tax year	2011
India | Minimum
Schedule Of Income Taxes [Line Items]
Open tax year	2006
India | Maximum
Schedule Of Income Taxes [Line Items]
Open tax year	2012
Japan | Minimum
Schedule Of Income Taxes [Line Items]
Open tax year	2007
Japan | Maximum
Schedule Of Income Taxes [Line Items]
Open tax year	2011
United Kingdom | Minimum
Schedule Of Income Taxes [Line Items]
Open tax year	2008
United Kingdom | Maximum
Schedule Of Income Taxes [Line Items]
Open tax year	2011