Annual report pursuant to Section 13 and 15(d)

Common Stock and Stockholders' Equity - Additional Information (Detail)

v3.3.1.900
Common Stock and Stockholders' Equity - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based awards vesting period 3 years    
Restricted shares to selected key personnel   1,541,395  
Allocated Share-based Compensation Expense $ 8.4 $ 9.3 $ 9.4
Total fair value of the shares vested $ 8.0 $ 7.1 $ 7.4
Weighted-average grant-date fair value of shares granted (in usd per share) $ 3.08 $ 6.66 $ 4.77
Non-vested restricted stock awards and restricted stock units (in shares)   3,344,813  
Performance units under 2010 Long Term Incentive Plan (in shares) 2,996,151   2,602,973
Performance units forfeited (in shares) 103,062    
Performance period - awards percentage 200.00%    
Phantom Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 0.4    
Performance units under 2010 Long Term Incentive Plan (in shares) 541,127 0 0
Performance units forfeited (in shares) 0 0 0
Performance Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Allocated Share-based Compensation Expense $ 2.3 $ 1.9 $ 1.8
Performance units under 2010 Long Term Incentive Plan (in shares) 17,091 16,574 18,000
Performance units forfeited (in shares) 0 110 13,358
Nominal value $ 100.00    
Nonvested RSUs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Non-vested restricted stock awards and restricted stock units (in shares) 4,774,408    
Total unrecognized compensation cost of unamortized non-vested stock awards $ 7.6    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 18 months    
Chief Financial Officer [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance units under 2010 Long Term Incentive Plan (in shares)   261,438  
2010 Long-Term Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock granted 11,000,000    
2010 Long-Term Incentive Plan [Member] | Common Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option outstanding or exercisable (in shares) 1,311,131