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Share-based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested shares, Granted 0 100,000 150,000
Share-based compensation expenses $ 4,900    
Restricted Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum unrecognized cost for stock options $ 7,800    
Unrecognized compensation cost, weighted average period of recognition 2 years 2 months 12 days    
Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expenses $ 193 $ 4,305 $ 5,820
Maximum unrecognized cost for stock options $ 300    
Unrecognized compensation cost, weighted average period of recognition 1 year 3 months 18 days    
Time Based Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Investor internal rate of return, percentage 25.00%    
Tranche Three [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Investor internal rate of return, percentage 30.00%    
Tranche B and C [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Option vesting condition Pursuant to the terms of the 2010 Plan, Tranche A stock options will generally vest in five equal installments, except for some grants as specified in the stock agreement, Tranche B options granted to employees and certain directors would vest at such time as the Investor Internal Rate of Return (“IRR”) equals or exceeds 25%, except for one grant that vests upon a 20% IRR, based on cash proceeds received by Apollo Investment Fund VII, L.P. (the “Investor”), and Tranche C options would vest at such time as the IRR equals or exceeds 30% based on cash proceeds received by the Investor.    
One Grant [Member] | Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Investor internal rate of return, percentage 20.00%    
2010 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance 5,843,208    
Nonvested shares, Granted 0    
Equity Incentive Plans contractual term 10 years    
2013 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance 5,956,882