Annual report pursuant to Section 13 and 15(d)

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

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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Valuation and Qualifying Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 2,318 $ 2,363 $ 914
Additions Charged to Income 4,786 3,377 3,676
Deduction (4,636) (3,422) (2,227)
Balance at End of Year $ 2,468 $ 2,318 $ 2,363