Effects of Derivative Instruments on Financial Statements (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Amount of gain (loss) recognized in other comprehensive income (loss) attributable to MII	$ 4,505	$ (3,236)
Cost of Operations
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Income (loss) reclassified from AOCI into income: effective portion attributable to MII	430	2,474
Other income (expense) - net
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Gain (loss) recognized in income: ineffective portion and amount excluded from effectiveness testing attributable to MII	$ 2,516	$ (3,434)