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Share Based Compensation - Additional Information (Detail)
3 Months Ended 12 Months Ended
Mar. 31, 2016
director
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 6,643,000 $ 4,037,000 $ 4,246,000
Fair value of awards granted to retirement eligible employees and expensed at date of grant   9,000 $ 600,000 517,000
Unrecognized share-based compensation expense related to non-vested equity-settled awards, restricted stock and stock options   $ 1,424,000    
Weighted average period over which amount will be recognized   4 years    
Shares issued out of treasury stock | shares   322,586 300,491  
Vesting of restricted stock awards and exercises of stock options, shares withheld | shares   75,870 25,082  
Payroll taxes on restricted stock and stock options   $ 981,000 $ 222,000 762,000
Board of Director Fees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   449,000 725,000 1,203,000
Cash Settled Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 634,000 717,000 (3,127,000)
Cash Settled Awards | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   3 years    
Cash Settled Awards | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   5 years    
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   4 years    
Expiration period   10 years    
Fair value of awards settled in cash   $ 1,581,000 154,000 $ 206,000
Fair value of vested cash-settled awards   $ 0 1,758,000  
Granted, equivalent units | shares   0    
Cash Settled Restricted Stock Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, weighted average grant date fair value | $ / shares   $ 0.00   $ 13.26
Fair value of awards settled in cash   $ 2,178,000 $ 1,195,000 $ 2,469,000
Granted, equivalent units | shares   0    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   5 years    
Granted, equivalent units | shares   198,000 313,000  
Market-leveraged stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   3 years    
Granted, equivalent units | shares       234,000
Weighted average estimated fair value of options at grant date | $ / shares       $ 15.11
Performance Stock Units Psu        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   3 years    
Equity-settled awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 5,001,000 $ 2,444,000 $ 5,026,000
Granted, weighted average grant date fair value | $ / shares   $ 14.55    
Fair value of vested cash-settled awards   $ 14,894,000 $ 2,884,000 $ 4,451,000
Granted, equivalent units | shares   198,000    
Weighted average estimated fair value of options at grant date | $ / shares   $ 14.55 $ 9.04 $ 12.99
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 0 $ 22,000 $ (8,000)
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation   $ 1,008,000 854,000 2,355,000
Period over or after performance stock unit vest   4 years    
Expiration period   10 years    
Intrinsic value of options exercised   $ 2,603,000 $ 61,000 $ 0
Options outstanding | shares   0 1,836,000  
Weighted average exercise price | $ / shares   $ 0.00    
Weighted average remaining contractual term   0 years 5 years  
Long Term Incentive Compensation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred cash compensation   $ 1,180,000 $ 620,000  
Requisite service period (in years)   3 years 2 years  
Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of new directors | director 2      
Granted (in shares) | shares 20,000      
Director | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period over or after performance stock unit vest   3 years    
Share-based Compensation Award, Tranche Two [Member] | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting, number | shares   6,500    
Tranche One | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting, number | shares 6,500      
Tranche Three | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting, number | shares 7,000      
D.R. Horton Merger Agreement | General and Administrative Expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Acceleration of vesting and settlement of equity   $ 4,349,000