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Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Remaining shares available for issuance 5,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized  
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted during period 71,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Share-based compensation awards, vesting period 36 months  
Unrecognized compensation expense $ 3,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Stock based compensation expense 200,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
200,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares granted during period 279,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Share-based compensation awards, vesting period 36 months  
Unrecognized compensation expense 5,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Stock based compensation expense 500,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
500,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Equity Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense 0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
Stock Appreciation Rights (SARs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based compensation expense $ 0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
$ 0us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember