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Stock Compensation Plans - Details of Long-Term Compensation Plan and Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation [Abstract]    
Restricted stock $ 795us-gaap_RestrictedStockExpense $ 598us-gaap_RestrictedStockExpense
Long-term cash incentives 364us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense 44us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Total Expense $ 1,159us-gaap_AllocatedShareBasedCompensationExpense $ 642us-gaap_AllocatedShareBasedCompensationExpense