Annual report pursuant to Section 13 and 15(d)

Summary of Stock Option Transactions Under Equity Plan, Stock Incentive Plan, Multifamily Technology Solutions Plan and Board Plan (Detail)

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Summary of Stock Option Transactions Under Equity Plan, Stock Incentive Plan, Multifamily Technology Solutions Plan and Board Plan (Detail) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Number of Shares      
Outstanding, Beginning Balance 5,858,613 7,292,031 9,131,494
Granted 2,421,124 1,641,470 1,477,250
Exercised (1,556,865) (2,389,704) (3,117,058)
Forfeited/cancelled (800,470) (684,154) (547,969)
Expired (7,600) (1,030) (1,379)
Number of Shares, ending balance 5,914,802 5,858,613 7,292,031
Range of exercise prices beginning balance, lower limit $ 0.91 $ 0.91 $ 2
Range of exercise prices beginning balance, upper limit $ 29.5 $ 29.5 $ 27.18
Range of exercise prices, Granted lower limit $ 19.78 $ 17.67 $ 19.73
Range of exercise prices, Granted upper limit $ 25.7 $ 24.64 $ 29.5
Range of exercise prices Exercised, lower limit $ 0.91 $ 0.91 $ 0.91
Range of exercise prices Exercised, upper limit $ 25.24 $ 27.18 $ 27.18
Range of exercise prices Forfeited/cancelled, lower limit $ 4.28 $ 0.94 $ 4.28
Range of exercise prices Forfeited/cancelled, upper limit $ 29.5 $ 29.5 $ 29.5
Range of exercise prices Expired, lower limit $ 24.03 $ 0.94 $ 4.28
Range of exercise prices Expired, upper limit $ 24.64 $ 27.18 $ 6
Range of exercise prices Ending Balance, lower limit $ 0.91 $ 0.91 $ 0.91
Range of exercise prices Ending Balance, upper limit $ 29.5 $ 29.5 $ 29.5
Weighted-Average Exercise Price      
Beginning Balance $ 13.97 $ 9.95 $ 6.05
Granted $ 22.20 $ 20.09 $ 24.09
Exercised $ 6.81 $ 5.05 $ 4.07
Forfeited/cancelled $ 18.71 $ 17.04 $ 12.94
Expired $ 24.35 $ 2.73 $ 5.26
Ending Balance $ 18.56 $ 13.97 $ 9.95
MTS
     
Number of Shares      
Assumed MTS Plan     349,693
Range of exercise prices, Granted upper limit     $ 23.29
Range of exercise prices Exercised, lower limit     $ 0.91
Weighted-Average Exercise Price      
Assumed MTS Plan     $ 4.39