Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Commitments and Contingencies [Line Items]
Capital commitments for open purchase orders	$ 49.4
Bank guarantees	2.4
Notice period to acquire equity stake	60 days
Acquisition of company's maximum equity stake under service agreement	7.00%
Minimum
Commitments and Contingencies [Line Items]
Term period of guarantee letter of credit	1 year
Maximum
Commitments and Contingencies [Line Items]
Term period of guarantee letter of credit	5 years
Income Tax Assessment
Commitments and Contingencies [Line Items]
Tax Demands from income tax authorities	54.2
Amount paid in relation with demand	$ 18.5