Annual report pursuant to Section 13 and 15(d)

SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Valuation and Qualifying Accounts (Detail)

v2.4.1.9
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Valuation and Qualifying Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 914us-gaap_ValuationAllowancesAndReservesBalance $ 1,087us-gaap_ValuationAllowancesAndReservesBalance $ 979us-gaap_ValuationAllowancesAndReservesBalance
Additions Charged to Costs and Expenses 3,676us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 3,661us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense 1,794us-gaap_ValuationAllowancesAndReservesChargedToCostAndExpense
Deduction (2,227)us-gaap_ValuationAllowancesAndReservesDeductions (3,834)us-gaap_ValuationAllowancesAndReservesDeductions (1,686)us-gaap_ValuationAllowancesAndReservesDeductions
Balance at End of Year $ 2,363us-gaap_ValuationAllowancesAndReservesBalance $ 914us-gaap_ValuationAllowancesAndReservesBalance $ 1,087us-gaap_ValuationAllowancesAndReservesBalance