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Stock-based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense recognized     $ 2,493,000 $ 3,982,000 $ 8,149,000 $ 10,697,000 $ 12,785,000
Income taxes associated with stock-based compensation         $ 2,000,000 1,100,000 2,000,000
Number of Options Outstanding and Exercisable         11,730    
Exercise Price         $ 166.10    
Weighted Average Remaining Life (in years)         1 year    
Stock Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Total intrinsic value of options outstanding         $ 0 $ 0 $ 0
Number of option, Exercised     0   0 0 0
Latest year with option issuances         2008    
Number of options granted since 2008         0    
General and Administrative Expense              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense recognized $ 1,200,000 $ 2,100,000 $ 2,500,000 $ 4,000,000 $ 8,100,000 $ 10,700,000 $ 12,800,000
2009 Long Term Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Long-term Incentive Plan shares available for future awards of stock options, restricted stock grants or other equity awards         191,569