Quarterly report pursuant to Section 13 or 15(d)

Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail)

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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
9 Months Ended
Sep. 30, 2014
Schedule of Restricted Stock Unit [Line Items]  
Number of shares vesting at IRR level of at least 8.5% 65,832
Number of shares vesting at IRR level of at least 10.5% 131,683
Number of shares vesting at IRR level of at least 12.5% 197,515
Fair value of shares vesting at IRR level of at least 8.5% $ 1,879
Fair value of shares vesting at IRR level of at least 10.5% 3,758
Fair value of shares vesting at IRR level of at least 12.5% $ 5,637