Annual report pursuant to section 13 and 15(d)

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

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Summary of Significant Accounting Policies - Analysis of Allowance for Doubtful Accounts (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Balance at beginning of Year $ 3,136 $ 1,773
Charged to costs and expenses 6,534 5,251
Deductions (4,896) (3,888)
Balance at end of Year $ 4,774 $ 3,136