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Stockholder's Equity - Stock Options Outstanding and Exercisable (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Qualified Stock Option Plans [Member] | $5.10 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 5.10
Stock Options Outstanding, Shares Outstanding 11,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 1 year 11 months 1 day
Stock Options Outstanding, Weighted-Average Exercise Price $ 5.10
Stock Options, Intrinsic Value of Shares Outstanding $ 395,000
Stock Options Exercisable, Shares Exercisable 11,000
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 1 year 11 months 1 day
Stock Options Exercisable, Weighted-Average Exercise Price $ 5.10
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 395,000
Qualified Stock Option Plans [Member] | $7.86 - $8.17 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 7.86
Exercise prices, upper range $ 8.17
Stock Options Outstanding, Shares Outstanding 41,755
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 4 years 11 months 1 day
Stock Options Outstanding, Weighted-Average Exercise Price $ 7.87
Stock Options, Intrinsic Value of Shares Outstanding 1,384,000
Stock Options Exercisable, Shares Exercisable 30,030
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 4 years 11 months 1 day
Stock Options Exercisable, Weighted-Average Exercise Price $ 7.86
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 996,000
Qualified Stock Option Plans [Member] | $9.69 - $9.97 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 9.69
Exercise prices, upper range $ 9.97
Stock Options Outstanding, Shares Outstanding 132,650
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 4 years 9 months 29 days
Stock Options Outstanding, Weighted-Average Exercise Price $ 9.69
Stock Options, Intrinsic Value of Shares Outstanding 4,156,000
Stock Options Exercisable, Shares Exercisable 85,400
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 4 years 9 months 29 days
Stock Options Exercisable, Weighted-Average Exercise Price $ 9.69
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 2,675,000
Qualified Stock Option Plans [Member] | $29.99 - $34.50 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 29.99
Exercise prices, upper range $ 34.5
Stock Options Outstanding, Shares Outstanding 228,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 7 years 10 months 24 days
Stock Options Outstanding, Weighted-Average Exercise Price $ 34.40
Stock Options, Intrinsic Value of Shares Outstanding 1,509,000
Stock Options Exercisable, Shares Exercisable 75,240
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 7 years 10 months 24 days
Stock Options Exercisable, Weighted-Average Exercise Price $ 34.40
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 498,000
Qualified Stock Option Plans [Member] | $5.10 - $34.50 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 5.1
Exercise prices, upper range $ 34.5
Stock Options Outstanding, Shares Outstanding 413,405
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 6 years 5 months 16 days
Stock Options Outstanding, Weighted-Average Exercise Price $ 23.01
Stock Options, Intrinsic Value of Shares Outstanding 7,444,000
Stock Options Exercisable, Shares Exercisable 201,670
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 5 years 9 months 29 days
Stock Options Exercisable, Weighted-Average Exercise Price $ 18.39
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 4,564,000
Non-Qualified Stock Option Plans [Member] | $7.86 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 7.86
Stock Options Outstanding, Shares Outstanding 26,225
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 4 years 3 months 29 days
Stock Options Outstanding, Weighted-Average Exercise Price $ 7.86
Stock Options, Intrinsic Value of Shares Outstanding 870,000
Stock Options Exercisable, Shares Exercisable 20,975
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 4 years 3 months 29 days
Stock Options Exercisable, Weighted-Average Exercise Price $ 7.86
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 695,000
Non-Qualified Stock Option Plans [Member] | $8.01 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 8.01
Stock Options Outstanding, Shares Outstanding 155,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 2 years 9 months
Stock Options Outstanding, Weighted-Average Exercise Price $ 8.01
Stock Options, Intrinsic Value of Shares Outstanding 5,116,000
Stock Options Exercisable, Shares Exercisable 20,000
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 2 years 9 months
Stock Options Exercisable, Weighted-Average Exercise Price $ 8.01
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 660,000
Non-Qualified Stock Option Plans [Member] | $34.50 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 34.50
Stock Options Outstanding, Shares Outstanding 5,000
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 7 years 11 months 1 day
Stock Options Outstanding, Weighted-Average Exercise Price $ 34.50
Stock Options, Intrinsic Value of Shares Outstanding 33,000
Stock Options Exercisable, Shares Exercisable 1,650
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 7 years 11 months 1 day
Stock Options Exercisable, Weighted-Average Exercise Price $ 34.50
Stock Options Exercisable, Intrinsic Value of Shares Outstanding 11,000
Non-Qualified Stock Option Plans [Member] | $7.86 - $34.50 [Member]
  
Stockholders Equity [Line Items]  
Exercise prices, lower range $ 7.86
Exercise prices, upper range $ 34.5
Stock Options Outstanding, Shares Outstanding 186,225
Stock Options Outstanding, Weighted-Average Remaining Contractual Life in Years 3 years 1 month 10 days
Stock Options Outstanding, Weighted-Average Exercise Price $ 8.70
Stock Options, Intrinsic Value of Shares Outstanding 6,019,000
Stock Options Exercisable, Shares Exercisable 42,625
Stock Options Exercisable, Weighted-Average Remaining Contractual Life in Years 3 years 8 months 23 days
Stock Options Exercisable, Weighted-Average Exercise Price $ 8.96
Stock Options Exercisable, Intrinsic Value of Shares Outstanding $ 1,366,000