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Summary of Performance Units Activity (Detail) - Performance Units
 3 Months Ended
Mar. 31, 2016
$ / shares
shares
Number of Share Units  
Outstanding number of shares (Units), beginning balance 2,499,322
Granted, number of shares (Units) 0
Vested, number of shares (Units) 0
Forfeited, number of shares (Units) (62,411)
Adjustment upon final determination of level of performance goal achievement 7,274 [1]
Outstanding number of shares (Units), ending balance 2,444,185
Expected to vest, number of shares 2,211,468 [2]
Weighted Average Grant Date Fair Value  
Outstanding weighted average grant date fair value, beginning balance | $ / shares $ 19.95
Granted, weighted average grant date fair value | $ / shares 0
Vested, weighted average grant date fair value | $ / shares 0
Forfeited, weighted average grant date fair value | $ / shares 19.56
Adjustment upon final determination of level of performance goal achievement | $ / shares 22.72 [1]
Outstanding weighted average grant date fair value, ending balance | $ / shares $ 19.96
Maximum shares eligible to receive  
Outstanding maximum shares eligible to receive, beginning balance 2,499,322
Granted, maximum shares eligible to receive 0
Vested, maximum shares eligible to receive 0
Forfeited, maximum shares eligible to receive (62,411)
Adjustment upon final determination of level of performance goal achievement 7,274 [1]
Outstanding maximum shares eligible to receive, ending balance 2,444,185
[1] Represents an adjustment made in March 2016 to the number of shares subject to the PUs granted in 2015 upon certification of the level of achievement of the performance targets underlying such awards.
[2] The number of PUs expected to vest has been adjusted by an estimated forfeiture rate.