Changes to Financing Obligation to Acquire Non-controlling Interest (Detail) (Obligation for AWS call/put option, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Obligation for AWS call/put option
 
Schedule Of Reconciliation Of Changes In Fair Value Of Assets And Liabilities [Line Items]  
Balance at beginning of period $ 9,021
Accretion 1,083
Balance at end of period $ 10,104