Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail)

v2.4.1.9
Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Accounting Policies [Abstract]    
Balance at beginning of Year $ 4,774us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,136us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Charged to costs and expenses 5,774us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs 6,534us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Deductions (5,809)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries (4,896)us-gaap_AllowanceForDoubtfulAccountsReceivableRecoveries
Balance at end of Year $ 4,739us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 4,774us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent