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Activity of Awarded Restricted Stock Units (Detail)
12 Months Ended
Dec. 31, 2015
$ / shares
shares
Restricted Stock Units (RSUs)  
Number of shares  
Balance at beginning of year (in shares) 599,347 [1]
Granted (in shares) 544,030
Vested (in shares) (422,504)
Forfeited (in shares) (251,887)
Balance at end of year (in shares) 468,986 [1]
Weighted-Average Grant Date Fair Value  
Balance at beginning of year (in dollars per share) | $ / shares $ 7.93 [1]
Granted (in dollars per share) | $ / shares 5.07
Vested (in dollars per share) | $ / shares 5.13
Forfeited (in dollars per share) | $ / shares 8.24
Balance at end of year (in dollars per share) | $ / shares $ 6.97 [1]
Performance Based Restricted Stock Units (PBRSUs)  
Number of shares  
Balance at beginning of year (in shares) 658,916
Granted (in shares) 282,181
Forfeited (in shares) 0
Balance at end of year (in shares) 941,097
Weighted-Average Grant Date Fair Value  
Balance at beginning of year (in dollars per share) | $ / shares $ 16.29
Granted (in dollars per share) | $ / shares 7.38
Forfeited (in dollars per share) | $ / shares 0.00
Balance at end of year (in dollars per share) | $ / shares $ 9.19
Retirement Eligible Employees, Equity Award | Restricted Stock Units (RSUs)  
Number of shares  
Balance at beginning of year (in shares) 346,777.000
Balance at end of year (in shares) 346,777.000
Minimum | Performance Based Restricted Stock Units (PBRSUs)  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Shares, Expected to Vest, Percentage 0.00%
Maximum | Performance Based Restricted Stock Units (PBRSUs)  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Share-based Compensation Arrangement by Share-based Payment Award, Shares, Expected to Vest, Percentage 200.00%
[1] Excludes 346,777 units at the beginning of the year and 346,777 units at the end of year that have vested due to retirement eligibility, but have not yet been settled or converted to common shares.