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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Restricted Stock Unit [Line Items]      
Number of shares vesting at IRR level of at least 8.5% 38,366 50,981 51,239
Number of shares vesting at IRR level of at least 10.5% 76,741 101,974 102,488
Number of shares vesting at IRR level of at least 12.5% 115,107 152,955 153,727
Fair value of shares vesting at IRR level of at least 8.5% $ 1,129 $ 1,103 $ 991
Fair value of shares vesting at IRR level of at least 10.5% 2,259 2,206 1,983
Fair value of shares vesting at IRR level of at least 12.5% $ 3,389 $ 3,308 $ 2,975