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Summary of Significant Accounting Policies - Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]      
Anti-dilutive securities 757us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 157us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 194us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount